Hi Anders,
I’d like to confirm if you or your former partner still have the username of the old account. If yes, you will be able to access the old account by using that username and password.
If you forget the password of that username, I’d like to suggest you reset the password and log in again.
If there are any errors occurs when you access the old account, could you please provide the error message for further troubleshooting?
Thanks,
Kent Gu