OK, I see it. The date fields on my form had the country name or RIC. So I tried putting in something else: 12/31/2020 and 12/30/2020 were accepted by the form, but still got a TT message that I cannot file because I chose the Simplified AMT method on form 6251 - this is not the error message identified above in the subject line in this community blog. I tried putting in 1099 taxes in the field, but TT would not accept it. So I'm back to the same place, unable to e-file. Again, I was able to file if I did not choose the simplified method on Form 6251, but it got rejected after I transmitted.
