"Citigroup's Marriott code CIT is one of the most widely circulated financial sector codes. FlyerTalk users report: "Citigroup code has been posted on public sites for 10+ years — it's one of the most-shared codes in the community." hotelcorporatecodes.com lists CIT with "⚠️ Sometimes" verification. NYC-area full-service Marriotts (near Citigroup HQ in Tribeca/Park Avenue) are more likely to verify. US domestic outside NYC: 5-15% check rate. Europe/Asia: meaningfully higher. Business card typically resolves verification requests."

"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 am very rarely asked to prove my eligibility for a rate...but they have every right to ask and if you can't produce it, you will be re-rated to the current rate, which is often even higher and there is no guarantee points rooms will be available. Doing online check in rarely helps this as most properties don't actually do online anyway - especially to people who are not returning guests to the property or elite. You are taking a gamble. One that is likely to be fine. But understand you are intentionally breaking the terms of the bonvoy program and if someone really cared, there can be consequences."