Call the Marriott ressie line, give them the name of the property, the code, & ask them to review the rate rules. If it doesn't say employees only & Marriott ressie agrees, then you should be able to use it I'd also have a print-out of the rate rules showing no id if challenged (and possibly a back-up ressie somewhere).

When I plug that code into dummy bookings at 2 hub cities, the rate rule DOES show 'be prepared to show id' etc.

Cheers.