Rocky,
I think someone gave you bad information. My CY club and my Marriott Rewards Gold Marquis card have the same number. I have received points from each of the properties all placed in one account. Statements list all the activity from both Courtyards and Marriotts. If I remember correctly, the application asks if you already have a MR number. Remember at CY's you only get 10 points per dollar on the room rate ONLY. None of the other incidental charges count. I would either get a paper application or call Courtyard Customer Service and talk to a different rep. Best of luck.