Exactly the same issue, since December. Have been in contact with HMRC several times now, the latest being today, and they're unable to help - seem to think the issue is with QB. Quickbooks are impossible to reach so are of no help at all. 1st penalty point arrived already so thinking of just changing software and demanding a refund for the last 9 months of zero service from QB! Appalling experience from start to finish, not user-friendly at all.