After you file

very confusing.  you may have 2 issues. one is putting the 2020-1099 on your 2021 return and the other is that the IRS wants you to verify your identity.  the request for 2019 info may be part of the verification process.  if the IRS wants identity verification and you're due a refund for 2021, you won't get it until you comply and furnish the info requested.