On Reddit I found this, which was exactly my situation, it worked for me:
I finally found a solution.
When I have created both google account I used my email address (non gmail).
Now I started using AG and gemini I have created a gmail address and the issue came from there.I removed the gmail service from my google account and AG works fine again.
It seems the same happens to users who change their gmail address.
Google account is so cooked lol