What is auth.tenantId in firebase phone authentication in react expo?

Question

I am trying to follow the tutorial for implementing firebase phone authentication into my react expo app. When I click the 'send verification code' button, it redirects to the ReCaptcha and I can solve it. When I click the 'confirm' button of the ReCaptcha it shows an error: Error: undefined is not an object (evaluating 'auth.tenantId')

I created a project in the firebase console of course and added everything to the firebaseConfig. What does this error mean, where could it have happended and how could I solve it?

Answer 1

Looks like I forgot to hand in the auth variable to the PhoneAuthProvider:

const phoneProvider = new PhoneAuthProvider(auth);