No Acces to My EA Account. Trying to disconnect shows Errorcode 9.0

When I try to unlink my Account I get an Errorcode 9.0 and have to restart the game.

Issues:

- If I try to disconnect my Account (Settings > Connect > Unlink account) it gives me the Errorcode 9.0 and crashes the game.

- The EA account currently connected is not accsesible anymore.

- I can't connect with a different EA account due to beeing unable to unlink the old one.

I can proof ownership of the Account, as it is connected to a Google Play account.

I hope this can be routed to a member of the team responsible for such issues as I didn't get any response through the in-game support ticket. 
Please identify by my Google Play account, that is connected.

Details

- Ally Code: [157-459-728]
- Current verified access: Google Play (Android)
- Error: Error Code 9.0 on EA unlink

If there is any additional Info needed I am happy to provide it. Thanks for the help.