So, I haven't heard back that my return was accepted, but I feel like it was clean this time. (I will update later if it was rejected again.)
So, here is what I did. I updated the tax software & forms (was already up-to-date). Then I followed the instruction from a previous post to delete the 8801 form. I'm not sure that did anything, but I would suggest doing it. The key step, as mentioned by someone else above, was going back to the AMT questions. What I missed the first time was unlike in previous years, the information from my prior (2018) tax return was not automatically transferred to Form 6251. When I manually entered the information on Form 6251 in the AMT credit dialogue the new Form 8801 was updated correctly and I finally had an entry in Line 25.
Hope this helps.
