Why can't I connect to my account from google play games?

@KDUBE1 

Did you sign into a different Google Play account recently? You can only be logged into one Google Play account on the device for Madden NFL 21 Mobile. The moment you log into the game on the device, you cannot play with another team on that device.

Try signing into a different Google Play account if you did indeed change recently or try changing the password with your account to re-sync the Google Play account to the EA servers. 

No i use only one damn account . 

You can try to clear your data and cache from Google Play services, Play games, or the game you have trouble with:

1. Open your Settings app .
2. Tap Apps & notifications See all apps.
3. Scroll down and tap Google Play Games.
4. Tap Storage Clear storage.
5. Re-open the Play Games app.

You can also re-try these steps for Google Play services or the game that you're having trouble with.

Source: Google Support