diff --git a/packages/core/src/lib/sign-in-experience.test.ts b/packages/core/src/lib/sign-in-experience.test.ts
index 68370de97..f84dfa19f 100644
--- a/packages/core/src/lib/sign-in-experience.test.ts
+++ b/packages/core/src/lib/sign-in-experience.test.ts
@@ -1,12 +1,21 @@
 import { BrandingStyle, SignInMethodState } from '@logto/schemas';
 
+import { ConnectorType } from '@/connectors/types';
 import RequestError from '@/errors/RequestError';
 import {
   validateBranding,
   validateSignInMethods,
   validateTermsOfUse,
 } from '@/lib/sign-in-experience';
-import { mockBranding, mockSignInMethods } from '@/utils/mock';
+import {
+  mockAliyunDmConnectorInstance,
+  mockBranding,
+  mockFacebookConnectorInstance,
+  mockGithubConnectorInstance,
+  mockSignInMethods,
+} from '@/utils/mock';
+
+const enabledConnectorInstances = [mockFacebookConnectorInstance, mockGithubConnectorInstance];
 
 describe('validate branding', () => {
   test('should throw when the UI style contains the slogan and slogan is empty', () => {
@@ -51,26 +60,66 @@ describe('validate terms of use', () => {
 
 describe('validate sign-in methods', () => {
   describe('There must be one and only one primary sign-in method.', () => {
-    test('should throw when there is no primary sign-in method', async () => {
+    test('should throw when there is no primary sign-in method', () => {
       expect(() => {
-        validateSignInMethods({
-          ...mockSignInMethods,
-          username: SignInMethodState.disabled,
-        });
+        validateSignInMethods({ ...mockSignInMethods, username: SignInMethodState.disabled }, []);
       }).toMatchError(
         new RequestError('sign_in_experiences.not_one_and_only_one_primary_sign_in_method')
       );
     });
 
-    test('should throw when there are more than one primary sign-in methods', async () => {
+    test('should throw when there are more than one primary sign-in methods', () => {
       expect(() => {
-        validateSignInMethods({
-          ...mockSignInMethods,
-          social: SignInMethodState.primary,
-        });
+        validateSignInMethods({ ...mockSignInMethods, social: SignInMethodState.primary }, []);
       }).toMatchError(
         new RequestError('sign_in_experiences.not_one_and_only_one_primary_sign_in_method')
       );
     });
   });
+
+  describe('There must be at least one enabled connector when the specific sign-in method is enabled.', () => {
+    test('should throw when there is no enabled email connector and email sign-in method is enabled', async () => {
+      expect(() => {
+        validateSignInMethods(
+          { ...mockSignInMethods, email: SignInMethodState.secondary },
+          // @ts-expect-error-this-line
+          enabledConnectorInstances
+        );
+      }).toMatchError(
+        new RequestError({
+          code: 'sign_in_experiences.enabled_connector_not_found',
+          type: ConnectorType.Email,
+        })
+      );
+    });
+
+    test('should throw when there is no enabled SMS connector and SMS sign-in method is enabled', () => {
+      expect(() => {
+        validateSignInMethods(
+          { ...mockSignInMethods, sms: SignInMethodState.secondary },
+          // @ts-expect-error-this-line
+          enabledConnectorInstances
+        );
+      }).toMatchError(
+        new RequestError({
+          code: 'sign_in_experiences.enabled_connector_not_found',
+          type: ConnectorType.SMS,
+        })
+      );
+    });
+
+    test('should throw when there is no enabled social connector and social sign-in method is enabled', () => {
+      expect(() => {
+        validateSignInMethods({ ...mockSignInMethods, social: SignInMethodState.secondary }, [
+          // @ts-expect-error-this-line
+          mockAliyunDmConnectorInstance,
+        ]);
+      }).toMatchError(
+        new RequestError({
+          code: 'sign_in_experiences.enabled_connector_not_found',
+          type: ConnectorType.Social,
+        })
+      );
+    });
+  });
 });
diff --git a/packages/core/src/lib/sign-in-experience.ts b/packages/core/src/lib/sign-in-experience.ts
index 362cd7e84..bc2c69053 100644
--- a/packages/core/src/lib/sign-in-experience.ts
+++ b/packages/core/src/lib/sign-in-experience.ts
@@ -6,6 +6,7 @@ import {
   TermsOfUse,
 } from '@logto/schemas';
 
+import { ConnectorInstance, ConnectorType } from '@/connectors/types';
 import assertThat from '@/utils/assert-that';
 
 export const validateBranding = (branding: Branding) => {
@@ -21,12 +22,41 @@ export const validateTermsOfUse = (termsOfUse: TermsOfUse) => {
   );
 };
 
-export const validateSignInMethods = (signInMethods: SignInMethods) => {
+const isEnabled = (state: SignInMethodState) => state !== SignInMethodState.disabled;
+
+export const validateSignInMethods = (
+  signInMethods: SignInMethods,
+  enabledConnectorInstances: ConnectorInstance[]
+) => {
   const signInMethodStates = Object.values(signInMethods);
   assertThat(
     signInMethodStates.filter((state) => state === SignInMethodState.primary).length === 1,
     'sign_in_experiences.not_one_and_only_one_primary_sign_in_method'
   );
 
-  // TODO: assert others next PR
+  if (isEnabled(signInMethods.email)) {
+    assertThat(
+      enabledConnectorInstances.some((item) => item.metadata.type === ConnectorType.Email),
+      'sign_in_experiences.enabled_connector_not_found',
+      { type: ConnectorType.Email }
+    );
+  }
+
+  if (isEnabled(signInMethods.sms)) {
+    assertThat(
+      enabledConnectorInstances.some((item) => item.metadata.type === ConnectorType.SMS),
+      'sign_in_experiences.enabled_connector_not_found',
+      { type: ConnectorType.SMS }
+    );
+  }
+
+  if (isEnabled(signInMethods.social)) {
+    assertThat(
+      enabledConnectorInstances.some((item) => item.metadata.type === ConnectorType.Social),
+      'sign_in_experiences.enabled_connector_not_found',
+      { type: ConnectorType.Social }
+    );
+    // TODO: assertNonemptySocialConnectorIds
+    // TODO: assertEnabledSocialConnectorIds
+  }
 };
diff --git a/packages/core/src/routes/sign-in-experience.test.ts b/packages/core/src/routes/sign-in-experience.test.ts
index 4b677d002..6aa13a974 100644
--- a/packages/core/src/routes/sign-in-experience.test.ts
+++ b/packages/core/src/routes/sign-in-experience.test.ts
@@ -1,15 +1,33 @@
 import { SignInExperience, CreateSignInExperience, TermsOfUse } from '@logto/schemas';
 
 import * as signInExpLib from '@/lib/sign-in-experience';
-import { mockBranding, mockSignInExperience, mockSignInMethods } from '@/utils/mock';
+import {
+  mockBranding,
+  mockFacebookConnectorInstance,
+  mockGithubConnectorInstance,
+  mockGoogleConnectorInstance,
+  mockSignInExperience,
+  mockSignInMethods,
+} from '@/utils/mock';
 import { createRequester } from '@/utils/test-utils';
 
 import signInExperiencesRoutes from './sign-in-experience';
 
-jest.mock('@/connectors', () => ({
-  ...jest.requireActual('@/connectors'),
-  getEnabledSocialConnectorIds: jest.fn(async () => ['facebook', 'github']),
-}));
+const connectorInstances = [
+  mockFacebookConnectorInstance,
+  mockGithubConnectorInstance,
+  mockGoogleConnectorInstance,
+];
+
+const getConnectorInstances = jest.fn(async () => connectorInstances);
+
+jest.mock('@/connectors', () => {
+  return {
+    ...jest.requireActual('@/connectors'),
+    getEnabledSocialConnectorIds: jest.fn(async () => ['facebook', 'github']),
+    getConnectorInstances: jest.fn(async () => getConnectorInstances()),
+  };
+});
 
 jest.mock('@/queries/sign-in-experience', () => ({
   findDefaultSignInExperience: jest.fn(async (): Promise<SignInExperience> => mockSignInExperience),
@@ -34,7 +52,7 @@ describe('signInExperiences routes', () => {
 
   it('PATCH /sign-in-exp', async () => {
     const termsOfUse: TermsOfUse = { enabled: false };
-    const socialSignInConnectorIds = ['abc', 'def'];
+    const socialSignInConnectorIds = ['github', 'facebook'];
 
     const validateBranding = jest.spyOn(signInExpLib, 'validateBranding');
     const validateTermsOfUse = jest.spyOn(signInExpLib, 'validateTermsOfUse');
@@ -49,7 +67,10 @@ describe('signInExperiences routes', () => {
 
     expect(validateBranding).toHaveBeenCalledWith(mockBranding);
     expect(validateTermsOfUse).toHaveBeenCalledWith(termsOfUse);
-    expect(validateSignInMethods).toHaveBeenCalledWith(mockSignInMethods);
+    expect(validateSignInMethods).toHaveBeenCalledWith(mockSignInMethods, [
+      mockFacebookConnectorInstance,
+      mockGithubConnectorInstance,
+    ]);
     // TODO: only update socialSignInConnectorIds when social sign-in is enabled.
 
     expect(response).toMatchObject({
diff --git a/packages/core/src/routes/sign-in-experience.ts b/packages/core/src/routes/sign-in-experience.ts
index 3c18d2038..b5c0668fe 100644
--- a/packages/core/src/routes/sign-in-experience.ts
+++ b/packages/core/src/routes/sign-in-experience.ts
@@ -1,6 +1,6 @@
 import { SignInExperiences } from '@logto/schemas';
 
-import { getEnabledSocialConnectorIds } from '@/connectors';
+import { getConnectorInstances, getEnabledSocialConnectorIds } from '@/connectors';
 import {
   validateBranding,
   validateTermsOfUse,
@@ -57,7 +57,13 @@ export default function signInExperiencesRoutes<T extends AuthedRouter>(router:
       }
 
       if (signInMethods) {
-        validateSignInMethods(signInMethods);
+        // TODO: LOG-2055 refactor connectors
+        const connectorInstances = await getConnectorInstances();
+        const enabledConnectorInstances = connectorInstances.filter(
+          (instance) => instance.connector.enabled
+        );
+
+        validateSignInMethods(signInMethods, enabledConnectorInstances);
       }
 
       // TODO: validate socialConnectorIds
diff --git a/packages/core/src/utils/mock.ts b/packages/core/src/utils/mock.ts
index 48ee24ed0..152cab777 100644
--- a/packages/core/src/utils/mock.ts
+++ b/packages/core/src/utils/mock.ts
@@ -390,4 +390,52 @@ export const mockSignInMethods: SignInMethods = {
   sms: SignInMethodState.disabled,
   social: SignInMethodState.disabled,
 };
+
+export const mockAliyunDmConnectorInstance = {
+  connector: {
+    id: 'aliyun-dm',
+    enabled: true,
+    config: {},
+    createdAt: 1_646_382_233_333,
+  },
+  metadata: {
+    type: ConnectorType.Email,
+  },
+};
+
+export const mockFacebookConnectorInstance = {
+  connector: {
+    id: 'facebook',
+    enabled: true,
+    config: {},
+    createdAt: 1_646_382_233_333,
+  },
+  metadata: {
+    type: ConnectorType.Social,
+  },
+};
+
+export const mockGithubConnectorInstance = {
+  connector: {
+    id: 'github',
+    enabled: true,
+    config: {},
+    createdAt: 1_646_382_233_000,
+  },
+  metadata: {
+    type: ConnectorType.Social,
+  },
+};
+
+export const mockGoogleConnectorInstance = {
+  connector: {
+    id: 'google',
+    enabled: false,
+    config: {},
+    createdAt: 1_646_382_233_000,
+  },
+  metadata: {
+    type: ConnectorType.Social,
+  },
+};
 /* eslint-enable max-lines */
diff --git a/packages/phrases/src/locales/en.ts b/packages/phrases/src/locales/en.ts
index 179c0673e..d4352a11e 100644
--- a/packages/phrases/src/locales/en.ts
+++ b/packages/phrases/src/locales/en.ts
@@ -347,6 +347,7 @@ const errors = {
       'Empty "Terms of use" content URL. Please add the content URL if "Terms of use" is enabled.',
     empty_slogan:
       'Empty branding slogan. Please add a branding slogan if a UI style containing the slogan is selected.',
+    enabled_connector_not_found: 'Enabled {{type}} connector not found.',
     not_one_and_only_one_primary_sign_in_method:
       'There must be one and only one primary sign-in method. Please check your input.',
   },
diff --git a/packages/phrases/src/locales/zh-cn.ts b/packages/phrases/src/locales/zh-cn.ts
index 3d8de5093..7fa7e073a 100644
--- a/packages/phrases/src/locales/zh-cn.ts
+++ b/packages/phrases/src/locales/zh-cn.ts
@@ -344,7 +344,8 @@ const errors = {
     empty_content_url_of_terms_of_use:
       '空的《用户协议》内容链接。当启用《用户协议》时，请添加其内容链接。',
     empty_slogan: '空的标语。当使用包含标语的 UI 风格时，请添加标语。',
-    not_one_and_only_one_primary_sign_in_method: '主要的登录方式必须有且仅有一个。请检查你的输入。',
+    enabled_connector_not_found: '未找到可用的 {{type}} 类型的连接器。',
+    not_one_and_only_one_primary_sign_in_method: '主要的登录方式必须有且仅有一个，请检查你的输入。',
   },
   swagger: {
     invalid_zod_type: '无效的 Zod 类型，请检查路由 guard 配置。',