I'm in receipt of a VAT Notice of Assessment from HMRC which states they have not received a return for which QuickBooks Online assures me has been sent and accepted for the date range concerned.

Hello Glenn

Thanks for reaching out to the Community.We are speaking with our Making Tax Digital senior support to see if we can get a log for you to pass onto them as proof that it has been accepted and submitted for the date range concerned. We have created a case and we will email you from it and continue this conversation further as we may need to get your VAT number and as this is a public chat we do not want that information in here for your own security.

Thanks

Emma