I have had the same issue helping my son-in-law file their joint return. his wife, my daughter, died in December 2019. They filed a joint 2018 return. This is clearly a Turbotax issue. Turbotax not only is saying the IRS is asking for the "Spouse's Prior Year PIN". There is no provision for entering one for the deceased spouse in 2019. Only the spouse doing the filing for a joint return.
I have tried refiling about 5 times over the last two days. I GIVE UP. I guess print and mail. (:
