Can I still e-file 2019 Amended Return using Turbo Tax?

I e-filed my 2019 1040 in March 2020 using Turbo Tax Premier.  Just discovered that I need to amend that return.  From everything I've read online I should be able to e-file my amended return using the same software.  I've made the change in the software after selecting "prepare an amended return."  But when I select File, E-File it gives me a message saying e-file is closed for the season.  I found an article saying Turbo Tax e-file shuts down in mid-October, but for amended returns it remains open for 3 years.  I read another article that said the IRS shut down e-filing about the same time (didn't specify whether that applied to regular returns and/or amended), but it would re-open in late January. 

 

Appreciate any suggestions anyone may have.