Sometimes the software will let you check a box, but won't perform the action, like trying to mask the 8879. If it's not some stupid box you missed, somehow, then you may want to verify the software will actually do it. 

Have you done this successfully before in a previous year?

The 2019 tax year is the first time I could not print the worksheet. I went through the print options making sure it prints regardless on all types of reports, but still no cigar. Never had this problem with the program before. I'm surprised nobody else has noticed this problem yet.