Thanks for the response. The 2021 return was filed in early August after receiving the SSN. They refused the child tax credit and the stimulus so there is actually $2800 involved. The IRS documentation says that if you requested the SSN before the extension deadline (June 15 in this case) then it still qualifies. The October extension doesn't seem relevant in this case. Is there an alternative to filing an amended return? A phone call? The form 12203? We still have not received the actual notice even though they say it is dated Aug 29. I don't know how much time we have to dispute it.
We also filed an amended 2020 return, but I now realize this was wrong after reading the IRS fine print; The information on Turbo Tax made it sound like that was legitimate. What should we do about that? File another 2020 amended return going back to the original? The amended return is still in process.
