Is it the Michigan Home Heating form?  It appears to be a programming glitch. 

Turbotax has acknowledged it, but so far, no word from Intuit over here, since TT and PS use the same "engine", Im guessing the ETA for a fix should be relatively similar.

https://ttlc.intuit.com/community/tax-topics/help/error-household-member-ssn-is-invalid-in-michigan-...