Invalid Token Firebase Authentication

[Alexey Zykov]

Hi,

We are integrating Phone Authenticaiton via Flutter library

Last 2 weeks we recently get an error:
[firebase_auth/invalid-app-credential] Invalid token

Unfortunately we could not further trace it and auth still works on some devices most Android and some iOS as well

Already desperate need help or at least direction where to take a look, documentation and internet do not tell much about the error

Thank you