Cannot unlink unknown Steam account

Hello EA

After very long time i logged in my account because i needed to change my email. And i wanted try new Battlefield 6 open beta. 

Logged in to my account. Change to email and i add 2FA to protect my account.

When i tried play Battlefield 6 thru Steam and Log in i get message of already linked Steam account. 

From Connected accounts i saw unknown Steam account.

My problems is that i cannot unlink that unknown account. When i hit unlink button i get box to input 2FA code. After that comes remove Steam link. But when i hit unlink nothing happens. It doesn't do anything.

I thought i was having some network issue because adblock or something.  Firefox Developer Tools / Network show following error.

POST: https://myaccount.ea.com/am/data/1/delink-external-party

Status: 409

How can i unlink unknown account and is this new problem and when it might be resolved ?

Thanks for the assistance!

-MrDelisco-