Why in Payroll - Pay Run - show HMRC submission not sent but I get an email from HMRC to say Successful Submission?

Hi mark-precisionto Thanks for reaching out to us here on the Community. We are aware of the issue that you're experiencing and our engineers are working towards resolving the issue. We've have added your details to the investigation, created a case in relation to this contact and you'll receive an email from that case if there are any updates or when the issue is resolved.