Amended 2020 Return with TT Online; Rejected, now can't access return via TT Online

Hello, definitely need some help on this one (TT rep was of no help...).

I filed an amendment for my 2020 tax return with TT Online. After filing, the IRS rejected the return. TT sent me an email stating the following:

 

/Return/ReturnHeader/FilingSecurityInformation/TotalPreparationSubmissionTs - Data in the return is missing or invalid. Please double check your entries.

 

I click on the "Let's fix my return", logged in, and it takes me to Tax Home. When I go to my 2020 return section, it won't let me access my return via TT Online anymore!!! I have to download the Desktop Version to continue (with no explanation why I have to do this).

 

How do I fix this?!