I agree with others on this thread. This functionality worked in Turbotax last year. Intuit appear to have found a way to take away the eFile feature which has a value we all paid for. I think we are owed a refund from the vendor. I've now invested too much time to back out of TT for this year but this should have been warned way before doing the error check and investing so much time.
Separately, I can't quite understand from above answers by @SusanY1 if listing 'zero' or blank 3520 forms on the 8938 form would make an eFile 8938 form out of compliance when submitting a different number of 3520 paper forms to Ogden by mail. I'm pretty well resigned to paper filing and cross checking responses in all the different forms manually - very tedious
