Same here. 2019 Return had to be mailed in last year for same reason - AGI matched and "0" didn't work either. Now 2019 return still not processed (filed timely) and it looks like we have to mail 2020's return as well, since it won't let us e-file for the same reason. What are the odds 2020's return will be processed in time for next year, since we have to mail yet again? The AGI matches, and I've tried "0"; neither works.
