[firebaseui] signInWithRedirect: auth/auth-domain-config-required Error after a while

[rchamila]

We are getting [firebaseui] signInWithRedirect: auth/auth-domain-config-required though we have configured modules correctly as below in out AuthModule.ts file

AngularFireModule.initializeApp(environment.firebase.auth.options), AngularFireAuthModule, FirebaseUIModule.forRoot(firebaseUiAuthConfig),

We have setup the domains and authkeys correctly. Angular app is deployed on to GCP as an App Service and it works as soon as the deployment completes. But next day it will give above error

Versions we are using here
"firebaseui": "^6.0.2",
"firebaseui-angular": "^6.1.3",

What could be the possible issues here