"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 have stayed 100s of times with various corporate rates (including Japan) and the only hotel that has asked is W hotels. Even then they didn’t push much. I have been a consultant for 20 years and many clients require you to use their rates when they are paying the bill. The hotel doesn’t have an up to date list of every employee that works for a company globally. The woman at the W said “I don’t really care, just show me anything on your phone that says your name and that company. You can type an email now “."

"We know what the various Deloitte, EY, PwC, Google, Meta, etc badges look like. If you work for the company, it’s not a problem to verify that you work there. We do this for the random people that say they work for Deloitte, when in reality, they just refill the vending machine at a Deloitte office."