Need a quick fix for mobile login - User onboarding planned for tomorrow

Hey guys,
we are looking to share our mobile app with the first users. But all of the sudden, the Login does not work. More specifically, they need to redo the login everytime they open the app again.

Does someone have an idea and can help, maybe it is a quick fix?

It would help us a lot!

Do you have “Stay logged in” set to “yes”
Screen Shot 2022-05-19 at 3.34.21 PM