If Box 6 on your 1099-NEC is blank but requires a 12-digit number, here’s what you can do:
Handling a Blank Box 6 on 1099-NEC
Check Box 5: If Box 5 (State Tax Withheld) is empty, you can leave Box 6 (State/Payer's State Number) blank (not $0). and the system should let you bypass
If Box 5 has an amount withheld, you will need to contact the issuer for their State ID#.