What to do when play store tells "Authentication required you need to sign in with your google account" And then I sign up but still the same I can't install apps.


This is a common problem and is often solved with little work.

This should fix your problem:

1) Remove your Google Account (From you device settings)
2) Clear Google-Play-Store cache and data
3) Sign-in with your Google Account again
4) Try to download an app

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