"E&Y (alt) Marriott code 253511 is a secondary Ernst & Young code, alongside the primary EYC code. Fishbowl posts from Big 4 staff: "How do I use the Acc or E&Y codes at Marriott and get around the ID check piece?" — confirming that consulting firm ID checks are a well-known friction point. The same risk profile applies to secondary codes: US select-service essentially never checks; US full-service 10-20%; international meaningfully higher. EY (Ernst & Young) branded itself as EY globally in 2013 — some properties may still see "Ernst & Young" in the code description."

"I think the generic 'show corp id' designation means show the company business card. I think a lot of us don't have them or, if we do & we're not going to an office that we'd need to show them, leave them at home. I worked for some F500s that didn't require corp ids with shiny smiling faces on them & others that did; same with company credit cards. All, however, provided biz cards when working for them."

"I work front desk and it seems like management is really pushing to check IDs for any special rate. Personally im lazy and also don’t care that much to start a confrontation so I only verify govt rates and employee rates, but yes it is being enforced more harshly. Corporate rates I guess are easy to find online and thus abused. Again, I don’t care that much because they’re still pricey anyway !!"