Originally Posted by LPCJr
Not entirely true. I booked a room for my wife, put her name on the reservation, and my MR number in the reservation. I got points and stay credit. I'm really surprised, because I was at another Marriott property during the same time period. I also the points and credit for my stay. Evidently, their computer isn't smart enough to figure out that I couldn't be in two places at once.
I concur that getting points for others' stays (even while staying at another property) is possible. I've had it happen for me. However, to "expect" it, discuss it with anyone at Marriott prior to trying it, or ask for it after the fact would probably be a bad idea. IMO, your best bet is to book it through your online account with your number and the name of the person staying. Then, keep your mouth shut and cross your fingers.