Facebook AccessToken returns nil

I can no longer sign-in-with-Facebook inside my app as AcessToken return nil...

Here is my function:

let accessToken = AccessToken.current

    guard let accessTokenString = accessToken?.tokenString else {
        print("bruh")
        return
    }

It currently prints the "bruh".

It was working the other days!

I didn't change anything inside that file. But I changed the Project Name and the Bundle Identifier. Could this have anything to do with the error?

UPDATE: I deleted the old Facebook-Project and created a new one with the correct Bundle-ID. I also changed the ID and Secret Token inside Firebase.

Is there anything else I need to do??? really annoying ... Is there maybe a way to show an error to see what the actual problem is?