"MIT's Marriott code 363006 is a university institutional code. No FlyerTalk thread discusses MIT verification incidents. University codes at Marriott are used primarily for conference and research travel — a use pattern hotels accommodate with minimal scrutiny. MIT has strong presence near Boston (Kendall Square), where Marriott properties are plentiful and familiar with academic corporate rates. No verification-denial case documented. University codes are among the lowest-enforcement categories across all major hotel brands."

"I work for a company that is partially owned by a Fortune 100 company and we have their corporate rate code linked to our travel website, (although it is one of the ones that is very easy to figure out). In 4+ years I've never been asked for any ID, although a few times a year I get the question of "what company are you with?""

"AT&T is among the companies with the best Marriott negotiated rates. In the US, I've never been asked to show corporate ID. In Asia and Europe, I've been asked for corporate ID every single time. Since some companies don't put their name on badges for security reasons, the business card route is often tried first and usually accepted."