Are any of the income items coded to the spouse? 

No, nothing is coded to the ex.

Last year (2019) the return was MFS and I entered everything, but she was divorced in 2020, so I remove his info and changed her to Single. That was done, prior to working on her return but the critical diagnostic keeps showing up.

Thanks.

Screen 1 change back to MFS. Is the spouse still showing? If so, delete the full name, occupation, DOB any thing - annihilate that person. Then go back to single. 

Are there any hangers on, like capital loss carrryovers, etc that might be tied to the ex spouse.

It is there somewhere, put on your Sherlock hat!

I called ProConnect yesterday and they said to just ignore the error by clicking ignore, since she couldn't figure out what the problem was. I didn't think she was correct, but she insisted and of course it was rejected. This is unbelievable and the client needs proof that it has been filed.

I've gone through the entire return and can't find where the problem was. Last year I just had to put in her income into her column and 0 into the ex column since she didn't know his income, plus they didn't share any assets.

When I check MFS it just shows a last name, which is done by auto fill since his last name is different from her last name.

Thanks.

Based on your statement "Last year I just had to put in her income into her column and 0 into the ex column since she didn't know his income, plus they didn't share any assets." Do you have any input for the "Income Allocation for Community Property States"? If so, delete it. You may have to "Click on button to expand" if any of those input are not greyed out. 

There must be some residual input from last year that is messing it up. Maybe even the Prior Year Summary? 

The only problem I can find is with Form 8958 where it says Other registered domestic partner's SSN. The agent from PTO said to put not applicable which didn't fix the problem. Due to that being on the form that makes the form show up with an error. I can't seem to remove that option since once you click in the box, you're stuck with one of those options.