The replies thus far have no official TT reponse. There are many suggestions on source of problem, as well as workarounds, but no solid official information.
Thus, TT (if you are reading):
1. Is this a TT issue or an IRS issue? Successful use of other (more than one) programs imply it is a TT issue.
2. If IRS issue, please point to, or provide, official IRS documentation with contains evidence they are working on the problem. I cannot find anything online.
3. If TT issue, please provide status and expected date of fix.
It looks to me that IRS Publication 970, updated on Jan 17, 2020, resolved the issue.
