I wasn’t signed in apart from going through the linking in my dashboard, however I logged in separately then logged out again and tried again. Same thing.
I only got the confirmation email this morning, maybe if I wait a couple of days…?
I am having the same problem. I have been on holiday in Italy and while away received the email to re connect HMRC to quickfile. I have tried several times with no luck, and my tax return is late now.
Failed - says agent or client not authorised?? i have been filing for almost 2 years?