Yeah, you're not going to be able to e-file federal extensions for any entity returns with an original unextended due date, ignoring disaster declarations, prior to the e-filing date. Calendar year partnerships and S-corps had to be extended by 3/15 if you wanted to be able to e-file the extension. At this point, the only calendar-year extensions that can be e-filed are 1040s and 990s.

This is an IRS e-file schema issue, not an Intuit issue.