Angular NGRX cannot pass data to reducer when dispatching action from effect. Got Error - TypeError: Cannot freeze

I am using Angular NGRX for state management in my angular application. On dispatching login action i receives CognitoUser object from my login service as i am using AWS amplify service.

When i dispatch LoginSuccess action to pass this object i receives error TypeError: Cannot freeze. Login Success action is dispatched but data object is not received in reducer.

Here is my effect code

export class LoginEffects {
  login$ = createEffect(() =>
    this.actions$.pipe(
      ofType(LoginActions.login),
      switchMap((action) =>
        from(this.authService.login(action.username, action.password))
      ),
      catchError((error) => of(LoginActions.loginError(error))),
      map((user) => LoginActions.loginSuccess(user))
   )
  );

  // ... other effects
  constructor(
    private actions$: Actions,
    private authService: AuthService,
    private router: Router
  ) {}
}

However if i assign this response user into another object like this

const obj = { ...user };

Then i am receiving data in reducer but in case of CognitoUser object i am not receiving data in reducer.

How can i pass CognitoUser object in reducer?

from Angular NGRX cannot pass data to reducer when dispatching action from effect. Got Error - TypeError: Cannot freeze