Why do you get critical diagnostic that your return was filed after nov 30, 2020. It was filed in January 2020

[IRonMaN]

It's due to the latest, greatest bug created by Intuit.  They are shopping for a big can of Raid to fix it in the near future.

[Just-Lisa-Now-]

So it was a business return Efiled in January? 

Individual returns cant be Efiled yet, so if it was an individual return you thought you transmitted, that would explain the message.