This fix worked for me (it is now 2024 and the bug still exists so apparently TT has no plans for ever fixing it):
1. Go to Step by Step (changing via forms did not work for me)
2. Business Information> Member Summary> click the person who is supposed to the the Partnership Repr.
3. Go through their info making sure that "This member is not a Person" is not checked (TT seems to auto check and every time I go back to it, I find it checked again)
4. Tell us more about this Member: Uncheck " This member is the Partnership Representative."
5. Save Return
6. Run Error Check
7. Enter Address info, highlighted in Red
8. Under Taxpayer Signature be sure to check Partner (or LLC) AND Partnership Representative.
9. Push Send Return Button