I submitted my 2020 tax extension request on time last night but later received a rejection notice. I'm still not sure why or how to fix this. Can this still be fixed?

The email starts by saying: "R0000-679-01 - 'PrimaryPriorYearPIN' or 'PrimaryElectronicFilingPIN' or 'PrimaryPriorYearAGIAmt' in the Return Header must match the e-File database.