Update: fixed the issue!
Someone else gave me the idea. I'm restating in the way I was able to do it.
In the online version, I went back to Deductions tab. All the way back so that it asked me the initial questions to determine the deductions. It prompted me to take the standard deduction but I elected to itemize anyway (button at the bottom). Then I added the names of each charity plus the amounts donated in 2020 (> $300).
I was prompted again to take the standard deductions which I agreed to. Fast forward to the charitable donation tab, this time the correct amount (> 300) is pre-populated in the text bar. This is how I knew the problem had been solved. Filed smoothly from there. No more "unacceptable value" for 10b.
Hope this helps anyone who was still struggling!
