diff --git a/packages/auth/src/mfa/mfa_session.ts b/packages/auth/src/mfa/mfa_session.ts
index f9b8452d06d..dbb1f4995fc 100644
--- a/packages/auth/src/mfa/mfa_session.ts
+++ b/packages/auth/src/mfa/mfa_session.ts
@@ -14,6 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+import { AuthInternal } from '../model/auth';
 import { MultiFactorSession } from '../model/public_types';
 
 export const enum MultiFactorSessionType {
@@ -31,11 +32,12 @@ interface SerializedMultiFactorSession {
 export class MultiFactorSessionImpl implements MultiFactorSession {
   private constructor(
     readonly type: MultiFactorSessionType,
-    readonly credential: string
+    readonly credential: string,
+    readonly auth?: AuthInternal,
   ) {}
 
-  static _fromIdtoken(idToken: string): MultiFactorSessionImpl {
-    return new MultiFactorSessionImpl(MultiFactorSessionType.ENROLL, idToken);
+  static _fromIdtoken(idToken: string, auth?: AuthInternal): MultiFactorSessionImpl {
+    return new MultiFactorSessionImpl(MultiFactorSessionType.ENROLL, idToken, auth);
   }
 
   static _fromMfaPendingCredential(
diff --git a/packages/auth/src/mfa/mfa_user.test.ts b/packages/auth/src/mfa/mfa_user.test.ts
index a21b0d27b51..2c0da80a11a 100644
--- a/packages/auth/src/mfa/mfa_user.test.ts
+++ b/packages/auth/src/mfa/mfa_user.test.ts
@@ -84,6 +84,12 @@ describe('core/mfa/mfa_user/MultiFactorUser', () => {
       expect(mfaSession.type).to.eq(MultiFactorSessionType.ENROLL);
       expect(mfaSession.credential).to.eq('access-token');
     });
+    it('should contain a reference to auth', async () => {
+      const mfaSession = (await mfaUser.getSession()) as MultiFactorSessionImpl;
+      expect(mfaSession.type).to.eq(MultiFactorSessionType.ENROLL);
+      expect(mfaSession.credential).to.eq('access-token');
+      expect(mfaSession.auth).to.eq(auth);
+    });
   });
 
   describe('enroll', () => {
diff --git a/packages/auth/src/mfa/mfa_user.ts b/packages/auth/src/mfa/mfa_user.ts
index 55bd15f830b..b536d7e4fbe 100644
--- a/packages/auth/src/mfa/mfa_user.ts
+++ b/packages/auth/src/mfa/mfa_user.ts
@@ -49,7 +49,7 @@ export class MultiFactorUserImpl implements MultiFactorUser {
   }
 
   async getSession(): Promise<MultiFactorSession> {
-    return MultiFactorSessionImpl._fromIdtoken(await this.user.getIdToken());
+    return MultiFactorSessionImpl._fromIdtoken(await this.user.getIdToken(), this.user.auth);
   }
 
   async enroll(
diff --git a/packages/auth/src/platform_browser/mfa/assertions/phone.test.ts b/packages/auth/src/platform_browser/mfa/assertions/phone.test.ts
index 22e64593cfd..80a4a3b6574 100644
--- a/packages/auth/src/platform_browser/mfa/assertions/phone.test.ts
+++ b/packages/auth/src/platform_browser/mfa/assertions/phone.test.ts
@@ -58,7 +58,7 @@ describe('platform_browser/mfa/phone', () => {
 
   describe('enroll', () => {
     beforeEach(() => {
-      session = MultiFactorSessionImpl._fromIdtoken('enrollment-id-token');
+      session = MultiFactorSessionImpl._fromIdtoken('enrollment-id-token', auth);
     });
 
     it('should finalize the MFA enrollment', async () => {
@@ -75,6 +75,7 @@ describe('platform_browser/mfa/phone', () => {
           sessionInfo: 'verification-id'
         }
       });
+      expect(session.auth).to.eql(auth);
     });
 
     context('with display name', () => {
@@ -97,6 +98,7 @@ describe('platform_browser/mfa/phone', () => {
             sessionInfo: 'verification-id'
           }
         });
+      expect(session.auth).to.eql(auth);
       });
     });
   });
@@ -119,6 +121,7 @@ describe('platform_browser/mfa/phone', () => {
           sessionInfo: 'verification-id'
         }
       });
+      expect(session.auth).to.eql(undefined);
     });
   });
 });