Turbotax keeps telling to to fix my MN return before I can e-file

When trying to e-file, Turbotax keeps telling me to fix my MN return with this error:

"Form M1:  Federal AGI Electronic Filing has been selected; Line 1 must equal Federal Adjusted Gross Income..."

 My Federal Adjusted Gross Income is negative and Line 1 shows it as a positive with a check in the corresponding box.  I was warned of this by Turbotax when starting my return, "A Note About Negative Federal Adjusted Gross Income .....On Minnesota Form M1, the negative income amount is displayed as a positive number.  A box is checked on the form to indicate that it is negative.  So, don't be alarmed...."   The 2019 Form M1 instructions also say that this is correct.

 

Yet, it seems Form M1 is not accepting this and I cannot e-file, and the e-file charge has already been sent to my credit card.  Is this a bug that will be remedied? Any ideas?  I do not want to mail my return in.