"IBM (US) Hilton code 0901452 is the domestic US IBM Hilton code. Same enforcement profile as the International IBM code: low US domestic verification rate (well under 10%) but higher at airport corridor properties known for corporate code abuse enforcement. London and European Hilton properties significantly increased enforcement post-2022. IBM's massive employee headcount and Hilton partnership status means the code is deeply embedded in Hilton's GDS system with occasional automated audit flags for first-time users."

"but there is a specific Hilton.com URL we use for reservations (which is accessible not just from our corporate network) - booked a rate for tomorrow night for around 50% of what the cheapest Honors rate was - I have not had any communication from the hotel requesting proof of eligibility. ."

"Hilton and Marriott Japan actually do check to ensure you qualify for any special rates. They also scan your passport too just FYI. It's not the wild west out here. Be prepared to prove you are eligible for the code or have the rate switched if you can't. Hope you got a business card from your company."