Hey @2ccfb6c85a8d5330,
If you've recently unlinked another account from your EA Account, the only way to recover that progress would be to re-link the original accounts.
Since it seems you've recently used that however, you'll be unable to unlink that same account again as you've noticed.
If you're running into any trouble re-linking an account, please contact support directly so they can take a closer look at any other available options for the account. We are unable to make any changes to an account directly on the forums, so reaching out there will be the best bet to check for any alternatives in this case.