Unlinking Google Account from an old team account

I have linked my Google account to a team account on Bitbucket and now it is impossible to unlink it - so that I can use it on my personal bitbucket account.

The team account is now discontinued - so I can't access settings of that account. Is there a way how to unlink the Google account from a team account?
Can you unlink it manually for me?

In case this is a private ticket I send you the account info. Thanks for your help.