Because Marriott IT currently is a cluster & that's not news to anyone who's on FT, that would be one very strong reason why the OP should have quadruple checked everything rather than making a reservation (that he may or may not have actually made; we'll never know if it was user or IT error at this point) & heading off overseas w/o knowing if it was really a done deal rather than blithely assuming it was all ok.

Over the many years I've traveled I've assumed the reservations (whether any airline or any hotel, again not specific to MAR) were ok, but I always made sure I put (back then paper/now digital) back-up documentation where I could access it if there was/is a problem at check-in. The airline/hotel/car rental/train system should run smoothly when reservations are made, but just in case I take responsibility for my own reservations & have the back-up documentation I need.

Cheers.