I'm guessing you may have a NYS ID/license. This issue tends to come up with New York State residents.
The
document number is an 8 or 10 digit alphanumeric number found either on the
back of the license or lower right hand corner. It is not the same as
the drivers license number. Please see this link for a visual:
https://dmv.ny.gov/id-card/sample-photo-documents
