I've tried deleting the form and re-entering the information. The system still makes the same error. The distribution was made in 2021 and it keeps checking the box for 2020 on the 8915F. Its also not putting the FEMA code in the correct format of XX-NNNN-ST. It is putting it as NNNN-XX-ST. Which is my guess as to why the return was immediately rejected.
