I used Turbo online for amending 2020 return, made the changes and e-filed but it was rejected. When I signed in again I have to mail it. Is that why it was rejected?

It was immediately rejected and when I signed back in I had to use the 2020 desktop version and e-file was not available. All the info is accurate so I want to be sure the reason for the rejection was because e-file is not available. Here is what it said under "what happened":/Return/ReturnHeader/FilingSecurityInformation/TotalPreparationSubmissionTs - Data in the return is missing or invalid. Please double check your entries.