Trying to e-file an Amended return that has already been accepted, but Turbo Tax says the "Amended return area" isn't ready yet. What is that and what should I do at this point?

I am trying to E-file an "Amended return" (because of a late 1099-int) of my 2020 Federal return which was accepted 5 days ago.  Turbo Tax says the "Amended Return Area" isn't ready yet and to try back later........I   updated the inputs in Turbo Tax, but it won't let me e-file the Amended federal return.