Got mine to file!
I was getting this error with all transactions that were automatically imported from M1 Finance. To fix it, I removed the automatically imported M1 Finance info completely, and re-entered the information manually. BUT - instead of entering in each sale one by one, I chose to enter sales totals, which was just 1 line on my 1099-B. This ended up allowing me to report the same amount of gains/losses, without the line-by-line details that were causing the issue. When I entered the sales totals amount (proceeds & cost basis totals), it did not require me to enter any dates acquired. After doing this I was able to get it to pass the Federal Review and allow me to file. Hope this helps others.