There have been a few threads in this forum about the ethics of using a discount code to which you are not entitled.

From other posts here, it appears that the NY Marriott Marquis appears to be more draconian than most about enforcing the use of those codes.

As a consultant, I frequently travel and stay in Marriott properties using my client's rate. I have been challenged only on a few occasions, but a simple explanation of my business and some documentation from the client has been sufficient.

Strangely enough, the AAA rate gets challenged the most even though it is only a token discount in most cases.