Trying to e-file federal, but keeps looping back to "We Need To Make One More Check"

I'm trying to e-file and have completed everything, but the last step says We Need To Make One More Check. It is asking about a w-2, box 12 code z value that I had to manually input. I have completed this step and click continue, but it keeps just looping back to the we need to make one more check and won't submit.

 

Any suggestions?