probably the proper form to use for the 1st year was actually the 2019 1120.
you can not e-file a second 2020 return.
you'll have to be a little creative. indicate to TT that this is an initial return.. that should solve most issues.
then you have to manually enter any 5/2020 items such as NOL carryforwards page 6 whatever and mail in the form.
