Amending 2021 return - signature date?

I am trying to file an amended 2021 return using the desktop version.  Everything looks good, but when I try to transmit, it says my signature date is invalid, and that the date needs to be between 1/1/2022 through 12/31/2022.  Obviously I am trying to file today, 4/7/2023.  Is there anyway around this?  How do I submit electronically?  I would prefer not to submit paper.