diff --git a/packages/experience/src/pages/IdentifierRegister/index.tsx b/packages/experience/src/pages/IdentifierRegister/index.tsx
index 37c8bca8b46..41c2be9d043 100644
--- a/packages/experience/src/pages/IdentifierRegister/index.tsx
+++ b/packages/experience/src/pages/IdentifierRegister/index.tsx
@@ -1,9 +1,10 @@
-import { AgreeToTermsPolicy, experience } from '@logto/schemas';
+import { AgreeToTermsPolicy, experience, SignInMode } from '@logto/schemas';
 import { useTranslation } from 'react-i18next';
 import { Navigate } from 'react-router-dom';
 
 import FocusedAuthPageLayout from '@/Layout/FocusedAuthPageLayout';
 import IdentifierRegisterForm from '@/components/IdentifierRegisterForm';
+import { useSieMethods } from '@/hooks/use-sie';
 import { identifierInputDescriptionMap } from '@/utils/form';
 
 import useIdentifierSignUpMethods from './use-identifier-sign-up-methods';
@@ -11,11 +12,14 @@ import useIdentifierSignUpMethods from './use-identifier-sign-up-methods';
 const IdentifierRegister = () => {
   const { t } = useTranslation();
   const signUpMethods = useIdentifierSignUpMethods();
+  const { signInMode } = useSieMethods();
 
   /**
-   * Fallback to sign-in page if no sign up methods are available (not allowed to create an account).
+   * Fallback to sign-in page in the following cases:
+   * - Sign-in mode is set to `SignIn` (user registration is not enabled in the sign-in experience configuration)
+   * - No sign up methods are available
    */
-  if (signUpMethods.length === 0) {
+  if (signInMode === SignInMode.SignIn || signUpMethods.length === 0) {
     return <Navigate to={`/${experience.routes.signIn}`} />;
   }
 
diff --git a/packages/experience/src/pages/SingleSignOnLanding/index.tsx b/packages/experience/src/pages/SingleSignOnLanding/index.tsx
index 4fe5913f343..a3457d49233 100644
--- a/packages/experience/src/pages/SingleSignOnLanding/index.tsx
+++ b/packages/experience/src/pages/SingleSignOnLanding/index.tsx
@@ -1,14 +1,22 @@
 import { AgreeToTermsPolicy, experience } from '@logto/schemas';
 import { useTranslation } from 'react-i18next';
+import { Navigate } from 'react-router-dom';
 
 import FocusedAuthPageLayout from '@/Layout/FocusedAuthPageLayout';
 import SingleSignOnForm from '@/components/SingleSignOnForm';
+import { useSieMethods } from '@/hooks/use-sie';
 import useTerms from '@/hooks/use-terms';
 
 const SingleSignOnLanding = () => {
   const { t } = useTranslation();
+  const { singleSignOnEnabled } = useSieMethods();
   const { agreeToTermsPolicy } = useTerms();
 
+  // Fallback to sign-in page if SSO is not enabled
+  if (!singleSignOnEnabled) {
+    return <Navigate to={`/${experience.routes.signIn}`} />;
+  }
+
   return (
     <FocusedAuthPageLayout
       pageMeta={{ titleKey: 'action.single_sign_on' }}
diff --git a/packages/integration-tests/src/api/sso-connector.ts b/packages/integration-tests/src/api/sso-connector.ts
index 99bf96371eb..90d1980554f 100644
--- a/packages/integration-tests/src/api/sso-connector.ts
+++ b/packages/integration-tests/src/api/sso-connector.ts
@@ -41,6 +41,11 @@ export const patchSsoConnectorById = async (id: string, data: Partial<SsoConnect
     })
     .json<SsoConnectorWithProviderConfig>();
 
+export const clearSsoConnectors = async () => {
+  const connectors = await getSsoConnectors();
+  await Promise.all(connectors.map(async (connector) => deleteSsoConnectorById(connector.id)));
+};
+
 export class SsoConnectorApi {
   readonly connectorInstances = new Map<string, SsoConnector>();
 
diff --git a/packages/integration-tests/src/tests/experience/first-screen.test.ts b/packages/integration-tests/src/tests/experience/first-screen.test.ts
index 520b8fd1214..7d0583d564d 100644
--- a/packages/integration-tests/src/tests/experience/first-screen.test.ts
+++ b/packages/integration-tests/src/tests/experience/first-screen.test.ts
@@ -1,7 +1,8 @@
 import { ConnectorType } from '@logto/connector-kit';
-import { SignInIdentifier } from '@logto/schemas';
+import { SignInIdentifier, SignInMode } from '@logto/schemas';
 
 import { updateSignInExperience } from '#src/api/sign-in-experience.js';
+import { clearSsoConnectors } from '#src/api/sso-connector.js';
 import { demoAppUrl } from '#src/constants.js';
 import {
   clearConnectorsByTypes,
@@ -16,8 +17,12 @@ const { describe, it } = devFeatureTest;
 describe('first screen', () => {
   beforeAll(async () => {
     await clearConnectorsByTypes([ConnectorType.Social, ConnectorType.Email, ConnectorType.Sms]);
+    await clearSsoConnectors();
     await setEmailConnector();
     await setSmsConnector();
+    await updateSignInExperience({
+      signInMode: SignInMode.SignInAndRegister,
+    });
   });
 
   describe('sign-in page', () => {
@@ -44,6 +49,9 @@ describe('first screen', () => {
 
   describe('single sign-on page', () => {
     it('should be landed on single sign-on page directly', async () => {
+      await updateSignInExperience({
+        singleSignOnEnabled: true,
+      });
       const experience = new ExpectExperience(await browser.newPage());
       const url = new URL(demoAppUrl);
       url.searchParams.set('first_screen', 'single_sign_on');
@@ -51,6 +59,19 @@ describe('first screen', () => {
       experience.toBeAt('single-sign-on');
       await experience.page.close();
     });
+
+    it('should fallback to sign-in page if SSO is not enabled', async () => {
+      // Turn off SSO
+      await updateSignInExperience({
+        singleSignOnEnabled: false,
+      });
+      const experience = new ExpectExperience(await browser.newPage());
+      const url = new URL(demoAppUrl);
+      url.searchParams.set('first_screen', 'single_sign_on');
+      await experience.page.goto(url.href, { waitUntil: 'networkidle0' });
+      experience.toBeAt('sign-in');
+      await experience.page.close();
+    });
   });
 
   describe('identifier sign-in page', () => {
@@ -84,6 +105,7 @@ describe('first screen', () => {
             },
           ],
         },
+        signInMode: SignInMode.SignIn,
       });
 
       // eslint-disable-next-line @silverhand/fp/no-mutation
@@ -161,6 +183,7 @@ describe('first screen', () => {
           password: false,
           verify: true,
         },
+        signInMode: SignInMode.SignInAndRegister,
       });
 
       // eslint-disable-next-line @silverhand/fp/no-mutation
@@ -197,5 +220,15 @@ describe('first screen', () => {
       await experience.page.goto(url.href, { waitUntil: 'networkidle0' });
       experience.toBeAt('sign-in');
     });
+
+    it('should fallback to sign-in page if sign-in mode is `SignIn` only', async () => {
+      await updateSignInExperience({
+        signUp: { identifiers: [SignInIdentifier.Email], password: false, verify: true },
+        signInMode: SignInMode.SignIn,
+      });
+
+      await experience.page.goto(url.href, { waitUntil: 'networkidle0' });
+      experience.toBeAt('sign-in');
+    });
   });
 });