Hi!
I don’t know if posting credentials is good practice, but at least they take to a private ip not reachable from outside.
About your question, chances are there is a different android version on the non-working machine. Different android versions imply different APIs.
Another possible source of conflict are permissions. Make sure the app is requesting permissions to user, user is granting them and “Google Play Protection” is not removing permissions. It tends to revoke permissions even when instructed not to do so.