diff --git a/changelog/31094.txt b/changelog/31094.txt
new file mode 100644
index 0000000000..a05e2ce8ff
--- /dev/null
+++ b/changelog/31094.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+ui: Revert camelizing of parameters returned from `sys/internal/ui/mounts` so mount paths match serve value
+```
\ No newline at end of file
diff --git a/ui/app/routes/vault/cluster/auth.js b/ui/app/routes/vault/cluster/auth.js
index 5094335d3d..be32ae9054 100644
--- a/ui/app/routes/vault/cluster/auth.js
+++ b/ui/app/routes/vault/cluster/auth.js
@@ -23,6 +23,10 @@ export default class AuthRoute extends ClusterRouteBase {
   @service store;
   @service version;
 
+  get adapter() {
+    return this.store.adapterFor('application');
+  }
+
   beforeModel() {
     return super.beforeModel().then(() => {
       return this.version.fetchFeatures();
@@ -89,10 +93,9 @@ export default class AuthRoute extends ClusterRouteBase {
   }
 
   async fetchLoginSettings() {
-    const adapter = this.store.adapterFor('application');
     try {
       // TODO update with api service when api-client is updated
-      const response = await adapter.ajax(
+      const response = await this.adapter.ajax(
         '/v1/sys/internal/ui/default-auth-methods',
         'GET',
         this.api.buildHeaders({ token: '' })
@@ -114,11 +117,13 @@ export default class AuthRoute extends ClusterRouteBase {
 
   async fetchMounts() {
     try {
-      const resp = await this.api.sys.internalUiListEnabledVisibleMounts(
+      const { data } = await this.adapter.ajax(
+        '/v1/sys/internal/ui/mounts',
+        'GET',
         this.api.buildHeaders({ token: '' })
       );
       // return a falsy value if the object is empty
-      return isEmptyValue(resp.auth) ? null : resp.auth;
+      return isEmptyValue(data.auth) ? null : data.auth;
     } catch {
       // catch error if there's a problem fetching mount data (i.e. invalid namespace)
       return null;
diff --git a/ui/app/routes/vault/cluster/dashboard.js b/ui/app/routes/vault/cluster/dashboard.js
index fbaffb4614..b4b33386a8 100644
--- a/ui/app/routes/vault/cluster/dashboard.js
+++ b/ui/app/routes/vault/cluster/dashboard.js
@@ -30,6 +30,7 @@ export default class VaultClusterDashboardRoute extends Route.extend(ClusterRout
 
   async model() {
     const clusterModel = this.modelFor('vault.cluster');
+    const adapter = this.store.adapterFor('application');
     const hasChroot = clusterModel?.hasChrootNamespace;
     const replication =
       hasChroot || clusterModel.replicationRedacted
@@ -40,9 +41,10 @@ export default class VaultClusterDashboardRoute extends Route.extend(ClusterRout
           };
     const requests = [
       this.getVaultConfiguration(hasChroot),
-      this.api.sys.internalUiListEnabledVisibleMounts().catch(() => ({})),
+      adapter.ajax('/v1/sys/internal/ui/mounts', 'GET').catch(() => ({})),
     ];
-    const [vaultConfiguration, { secret }] = await Promise.all(requests);
+    const [vaultConfiguration, { data }] = await Promise.all(requests);
+    const secret = data.secret;
     const secretsEngines = this.api
       .responseObjectToArray(secret, 'path')
       .map((engine) => new SecretsEngineResource(engine));
diff --git a/ui/app/routes/vault/cluster/secrets/backends.ts b/ui/app/routes/vault/cluster/secrets/backends.ts
index e6b5f877a1..e98382fb41 100644
--- a/ui/app/routes/vault/cluster/secrets/backends.ts
+++ b/ui/app/routes/vault/cluster/secrets/backends.ts
@@ -8,12 +8,16 @@ import { service } from '@ember/service';
 import SecretsEngineResource from 'vault/resources/secrets/engine';
 
 import type ApiService from 'vault/services/api';
+import type Store from '@ember-data/store';
 
 export default class SecretsBackends extends Route {
   @service declare readonly api: ApiService;
+  @service declare readonly store: Store;
 
   async model() {
-    const { secret } = await this.api.sys.internalUiListEnabledVisibleMounts();
+    const adapter = this.store.adapterFor('application');
+    const { data } = await adapter.ajax('/v1/sys/internal/ui/mounts', 'GET');
+    const secret = data.secret;
     return this.api.responseObjectToArray(secret, 'path').map((engine) => new SecretsEngineResource(engine));
   }
 }
diff --git a/ui/lib/sync/addon/components/secrets/page/destinations/destination/sync.ts b/ui/lib/sync/addon/components/secrets/page/destinations/destination/sync.ts
index be44167969..ed2310666e 100644
--- a/ui/lib/sync/addon/components/secrets/page/destinations/destination/sync.ts
+++ b/ui/lib/sync/addon/components/secrets/page/destinations/destination/sync.ts
@@ -15,6 +15,7 @@ import type RouterService from '@ember/routing/router-service';
 import type ApiService from 'vault/services/api';
 import type PaginationService from 'vault/services/pagination';
 import type FlashMessageService from 'vault/services/flash-messages';
+import type Store from '@ember-data/store';
 import type { SearchSelectOption } from 'vault/app-types';
 
 interface Args {
@@ -26,6 +27,7 @@ export default class DestinationSyncPageComponent extends Component<Args> {
   @service declare readonly api: ApiService;
   @service declare readonly flashMessages: FlashMessageService;
   @service declare readonly pagination: PaginationService;
+  @service declare readonly store: Store;
 
   constructor(owner: unknown, args: Args) {
     super(owner, args);
@@ -48,9 +50,11 @@ export default class DestinationSyncPageComponent extends Component<Args> {
 
   // unable to use built-in fetch functionality of SearchSelect since we need to filter by kv type
   async fetchMounts() {
+    const adapter = this.store.adapterFor('application');
     const mounts = [];
     try {
-      const { secret } = await this.api.sys.internalUiListEnabledVisibleMounts();
+      const { data } = await adapter.ajax('/v1/sys/internal/ui/mounts', 'GET');
+      const secret = data.secret;
       if (secret) {
         for (const path in secret) {
           const { type, options } = secret[path as keyof typeof secret];
diff --git a/ui/tests/acceptance/auth/auth-test.js b/ui/tests/acceptance/auth/auth-login-test.js
similarity index 98%
rename from ui/tests/acceptance/auth/auth-test.js
rename to ui/tests/acceptance/auth/auth-login-test.js
index 63152a8f65..a63eb6ad2a 100644
--- a/ui/tests/acceptance/auth/auth-test.js
+++ b/ui/tests/acceptance/auth/auth-login-test.js
@@ -130,13 +130,15 @@ module('Acceptance | auth login form', function (hooks) {
     });
 
     test('it renders preferred mount view if "with" query param is a mount path with listing_visibility="unauth"', async function (assert) {
-      await visit('/vault/auth?with=my-oidc%2F');
+      await visit('/vault/auth?with=my_oidc%2F');
       await waitFor(AUTH_FORM.tabBtn('oidc'));
       assert.dom(AUTH_FORM.authForm('oidc')).exists();
       assert.dom(AUTH_FORM.tabBtn('oidc')).exists();
       assert.dom(GENERAL.inputByAttr('role')).exists();
       assert.dom(GENERAL.inputByAttr('path')).hasAttribute('type', 'hidden');
-      assert.dom(GENERAL.inputByAttr('path')).hasValue('my-oidc/');
+      assert
+        .dom(GENERAL.inputByAttr('path'))
+        .hasValue('my_oidc/', 'mount path matches server value and is not camelized');
       assert.dom(GENERAL.button('Sign in with other methods')).exists('"Sign in with other methods" renders');
 
       assert.dom(GENERAL.selectByAttr('auth type')).doesNotExist('dropdown does not render');
@@ -151,7 +153,7 @@ module('Acceptance | auth login form', function (hooks) {
         .dom(AUTH_FORM.tabBtn('oidc'))
         .hasAttribute('aria-selected', 'true', 'it selects tab matching query param');
       assert.dom(GENERAL.inputByAttr('path')).hasAttribute('type', 'hidden');
-      assert.dom(GENERAL.inputByAttr('path')).hasValue('my-oidc/');
+      assert.dom(GENERAL.inputByAttr('path')).hasValue('my_oidc/');
       assert.dom(GENERAL.button('Sign in with other methods')).exists('"Sign in with other methods" renders');
       assert.dom(GENERAL.backButton).doesNotExist();
     });
@@ -390,7 +392,7 @@ module('Acceptance | auth login form', function (hooks) {
       await visit('/vault/auth');
 
       this.server.get('/sys/internal/ui/mounts', (_, req) => {
-        assert.strictEqual(req.requestHeaders['x-vault-namespace'], 'admin', 'header contains namespace');
+        assert.strictEqual(req.requestHeaders['X-Vault-Namespace'], 'admin', 'header contains namespace');
         req.passthrough();
       });
       await typeIn(GENERAL.inputByAttr('namespace'), 'admin');
diff --git a/ui/tests/acceptance/auth/login-settings-test.js b/ui/tests/acceptance/auth/login-settings-test.js
index 2d96d533b0..777939dc72 100644
--- a/ui/tests/acceptance/auth/login-settings-test.js
+++ b/ui/tests/acceptance/auth/login-settings-test.js
@@ -23,8 +23,8 @@ module('Acceptance | Enterprise | auth form custom login settings', function (ho
       `write test-ns/sys/namespaces/child -force`,
       `write sys/config/ui/login/default-auth/root-rule backup_auth_types=token default_auth_type=okta disable_inheritance=false namespace_path=""`,
       `write sys/config/ui/login/default-auth/ns-rule default_auth_type=ldap disable_inheritance=true namespace_path=test-ns`,
-      `write sys/auth/my-oidc type=oidc`,
-      `write sys/auth/my-oidc/tune listing_visibility="unauth"`,
+      `write sys/auth/my_oidc type=oidc`,
+      `write sys/auth/my_oidc/tune listing_visibility="unauth"`,
     ]);
     return await logout();
   });
@@ -37,7 +37,7 @@ module('Acceptance | Enterprise | auth form custom login settings', function (ho
     await runCmd([
       'delete sys/config/ui/login/default-auth/root-rule',
       'delete sys/config/ui/login/default-auth/ns-rule',
-      'delete sys/auth/my-oidc',
+      'delete sys/auth/my_oidc',
       'delete test-ns/sys/namespaces/child',
       'delete sys/namespaces/test-ns',
     ]);
@@ -73,7 +73,7 @@ module('Acceptance | Enterprise | auth form custom login settings', function (ho
   });
 
   test('it ignores login settings if query param references a visible mount path', async function (assert) {
-    await visit('/vault/auth?with=my-oidc%2F');
+    await visit('/vault/auth?with=my_oidc%2F');
     await waitFor(AUTH_FORM.tabBtn('oidc'));
     assert
       .dom(AUTH_FORM.tabBtn('oidc'))
diff --git a/ui/tests/acceptance/secret-engine-list-view-test.js b/ui/tests/acceptance/secret-engine-list-view-test.js
index 2214fc6342..7b7a5ab41f 100644
--- a/ui/tests/acceptance/secret-engine-list-view-test.js
+++ b/ui/tests/acceptance/secret-engine-list-view-test.js
@@ -33,6 +33,24 @@ module('Acceptance | secret-engine list view', function (hooks) {
     return login();
   });
 
+  // the new API service camelizes response keys, so this tests is to assert that does NOT happen when we re-implement it
+  test('it does not camelize the secret mount path', async function (assert) {
+    await visit('/vault/secrets');
+    await page.enableEngine();
+    await click(MOUNT_BACKEND_FORM.mountType('aws'));
+    await fillIn(GENERAL.inputByAttr('path'), 'aws_engine');
+    await click(GENERAL.submitButton);
+    await click(GENERAL.breadcrumbLink('Secrets'));
+    assert.strictEqual(
+      currentRouteName(),
+      'vault.cluster.secrets.backends',
+      'breadcrumb navigates to the list page'
+    );
+    assert.dom(SES.secretsBackendLink('aws_engine')).hasTextContaining('aws_engine/');
+    // cleanup
+    await runCmd(deleteEngineCmd('aws_engine'));
+  });
+
   test('after enabling an unsupported engine it takes you to list page', async function (assert) {
     await visit('/vault/secrets');
     await page.enableEngine();
diff --git a/ui/tests/helpers/auth/auth-helpers.ts b/ui/tests/helpers/auth/auth-helpers.ts
index 188cfeba3b..13c6a75ef8 100644
--- a/ui/tests/helpers/auth/auth-helpers.ts
+++ b/ui/tests/helpers/auth/auth-helpers.ts
@@ -102,7 +102,9 @@ export const SYS_INTERNAL_UI_MOUNTS = {
     options: {},
     type: 'userpass',
   },
-  'my-oidc/': {
+  // there was a problem with the API service camel-casing mounts that were snake cased
+  // so including a snake cased mount for testing
+  'my_oidc/': {
     description: '',
     options: {},
     type: 'oidc',
diff --git a/ui/tests/helpers/auth/response-stubs.ts b/ui/tests/helpers/auth/response-stubs.ts
index f5be60d340..4a96da246f 100644
--- a/ui/tests/helpers/auth/response-stubs.ts
+++ b/ui/tests/helpers/auth/response-stubs.ts
@@ -158,7 +158,7 @@ export const RESPONSE_STUBS = {
         },
         num_uses: 0,
         orphan: true,
-        path: 'auth/my-oidc/oidc/callback',
+        path: 'auth/my_oidc/oidc/callback',
         policies: ['default'],
         renewable: true,
         ttl: 2764799,
diff --git a/ui/tests/integration/components/auth/form-template-test.js b/ui/tests/integration/components/auth/form-template-test.js
index 5723bf7e8e..e1ce6caf32 100644
--- a/ui/tests/integration/components/auth/form-template-test.js
+++ b/ui/tests/integration/components/auth/form-template-test.js
@@ -110,7 +110,7 @@ module('Integration | Component | auth | form template', function (hooks) {
         ],
         oidc: [
           {
-            path: 'my-oidc/',
+            path: 'my_oidc/',
             description: '',
             options: {},
             type: 'oidc',
diff --git a/ui/tests/integration/components/auth/page/listing-visibility-test.js b/ui/tests/integration/components/auth/page/listing-visibility-test.js
index 0d9576a395..f3ea3b932f 100644
--- a/ui/tests/integration/components/auth/page/listing-visibility-test.js
+++ b/ui/tests/integration/components/auth/page/listing-visibility-test.js
@@ -74,7 +74,7 @@ module('Integration | Component | auth | page | listing visibility', function (h
   module('with a direct link', function (hooks) {
     hooks.beforeEach(function () {
       // if path exists, the mount has listing_visibility="unauth"
-      this.directLinkIsVisibleMount = { path: 'my-oidc/', type: 'oidc' };
+      this.directLinkIsVisibleMount = { path: 'my_oidc/', type: 'oidc' };
       this.directLinkIsJustType = { type: 'okta' };
     });
 
@@ -106,7 +106,7 @@ module('Integration | Component | auth | page | listing visibility', function (h
       assert.dom(AUTH_FORM.tabs).exists({ count: 1 }, 'only one tab renders');
       assert.dom(GENERAL.inputByAttr('role')).exists();
       assert.dom(GENERAL.inputByAttr('path')).hasAttribute('type', 'hidden');
-      assert.dom(GENERAL.inputByAttr('path')).hasValue('my-oidc/');
+      assert.dom(GENERAL.inputByAttr('path')).hasValue('my_oidc/');
       assert.dom(GENERAL.button('Sign in with other methods')).exists('"Sign in with other methods" renders');
       assert.dom(GENERAL.selectByAttr('auth type')).doesNotExist();
       assert.dom(AUTH_FORM.advancedSettings).doesNotExist();
diff --git a/ui/tests/integration/components/auth/page/login-settings-test.js b/ui/tests/integration/components/auth/page/login-settings-test.js
index 8a0c6c9ab6..d9b48042b8 100644
--- a/ui/tests/integration/components/auth/page/login-settings-test.js
+++ b/ui/tests/integration/components/auth/page/login-settings-test.js
@@ -118,7 +118,7 @@ module('Integration | Component | auth | page | ent login settings', function (h
       await this.renderComponent();
       assert.dom(AUTH_FORM.tabBtn('oidc')).hasText('OIDC', 'it renders default method');
       assert.dom(AUTH_FORM.tabs).exists({ count: 1 }, 'only one tab renders');
-      this.assertPathInput(assert, { isHidden: true, value: 'my-oidc/' });
+      this.assertPathInput(assert, { isHidden: true, value: 'my_oidc/' });
       await click(GENERAL.button('Sign in with other methods'));
       assert.dom(AUTH_FORM.tabs).exists({ count: 2 }, 'it renders 2 backup type tabs');
       assert
@@ -137,7 +137,7 @@ module('Integration | Component | auth | page | ent login settings', function (h
       assert.dom(AUTH_FORM.tabBtn('oidc')).hasText('OIDC', 'it renders default method');
       assert.dom(AUTH_FORM.tabs).exists({ count: 1 }, 'only one tab renders');
       assert.dom(AUTH_FORM.authForm('oidc')).exists();
-      this.assertPathInput(assert, { isHidden: true, value: 'my-oidc/' });
+      this.assertPathInput(assert, { isHidden: true, value: 'my_oidc/' });
       assert.dom(GENERAL.backButton).doesNotExist();
       assert.dom(GENERAL.button('Sign in with other methods')).doesNotExist();
     });
@@ -165,9 +165,9 @@ module('Integration | Component | auth | page | ent login settings', function (h
     });
 
     test('(default+backups): it hides advanced settings for default with visible mount but it renders for backups', async function (assert) {
-      this.visibleAuthMounts = { ...this.mountData('my-oidc/') };
+      this.visibleAuthMounts = { ...this.mountData('my_oidc/') };
       await this.renderComponent();
-      this.assertPathInput(assert, { isHidden: true, value: 'my-oidc/' });
+      this.assertPathInput(assert, { isHidden: true, value: 'my_oidc/' });
       await click(GENERAL.button('Sign in with other methods'));
       assert.dom(AUTH_FORM.tabBtn('userpass')).hasAttribute('aria-selected', 'true');
       await this.assertPathInput(assert);
@@ -178,7 +178,7 @@ module('Integration | Component | auth | page | ent login settings', function (h
     test('(default+backups): it only renders advanced settings for method without mounts', async function (assert) {
       // default and only one backup method have visible mounts
       this.visibleAuthMounts = {
-        ...this.mountData('my-oidc/'),
+        ...this.mountData('my_oidc/'),
         ...this.mountData('userpass/'),
         ...this.mountData('userpass2/'),
       };
diff --git a/ui/tests/integration/components/auth/tabs-test.js b/ui/tests/integration/components/auth/tabs-test.js
index 40fc14c0a1..b1b75684bc 100644
--- a/ui/tests/integration/components/auth/tabs-test.js
+++ b/ui/tests/integration/components/auth/tabs-test.js
@@ -32,7 +32,7 @@ module('Integration | Component | auth | tabs', function (hooks) {
       ],
       oidc: [
         {
-          path: 'my-oidc/',
+          path: 'my_oidc/',
           description: '',
           options: {},
           type: 'oidc',
@@ -98,7 +98,7 @@ module('Integration | Component | auth | tabs', function (hooks) {
     this.selectedAuthMethod = 'oidc';
     await this.renderComponent();
     assert.dom(GENERAL.inputByAttr('path')).hasAttribute('type', 'hidden');
-    assert.dom(GENERAL.inputByAttr('path')).hasValue('my-oidc/');
+    assert.dom(GENERAL.inputByAttr('path')).hasValue('my_oidc/');
   });
 
   test('it calls handleTabClick with tab method type', async function (assert) {