"Hyatt corporate codes as a category are documented on FlyerTalk: "You'll read countless stories of folks getting their IDs checked, and in some cases finding out that they needed either a special company letter or someone from the company to fax in their reason for staying there. There have also been some asks such as needing to have your company badge on hand." No BMW-specific Hyatt denial case found, but Hyatt is noted as stricter than Marriott overall."

"I use MY job's corporate code when booking personal travel. Most companies have a list of which hotels they contract with also allow personal bookings. If you're improperly using a corporate code, the hotel can cancel your booking or change your rate at check in."

"I would strongly advise the use of a corporate discount code that you are not entitled to. No doubt that IBM would receive a summary of all reservations made under their code and at what property, and no doubt lurkers on here would be well aware of unauthorised use. In essence it amounds to fraud and I would not want IBM or Hyatt's legal department against me."