Is there a card with the account number and name available that could be presented at the receptionist?
I don't think Marriott does physical elite cards anymore but you used to be able to request one online somewhere on the website .I'll look and see if it's still there .
You can use the mobile card which can be found in the Marriott mobile app, however, this isn't required. If you booked your room while logged into the Marriott website (or app) your rewards number is already linked to your reservation and you won't need to show anyone the membership card .
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