"UBS is explicitly discussed on FlyerTalk in the "Corporate ID required???" thread. One user: "Of the numerous Marriotts I've used my corporate code at in the US and Asia, I was only asked once — at the SF Marriott, because that particular hotel has seen a number of people abusing the corporate discount policy." Another: "Asia is the one place where I have been asked to show ID." A commenter noted: "if Marriott was really concerned about abuse, maybe they should have picked something other than stock ticker symbols as the prevalent corp code" — directly referencing UBS-style codes. hotelcorporatecodes.com: "⚠️ Sometimes," 10-15% discount. Financial services codes at full-service urban Marriotts in Europe (London, Zurich) carry meaningfully higher risk."

"I regularly stay at a renaissance once a month on our DTC rate and have done mobile check in but always end up at front desk. One time the front desk was like oh. We know you as you have been coming regularly, but I need to double check your id. I think it’s because someone shared it online and now it causes random checks for rest of us."

"I don't do mobile check-in if I'm wanting to upgrade. I check the app before I go in to see if any suites are available to book during the duration of my stay. If there is I just say "Would it be possible to get upgraded to an available suite with my platinum benefit?". Of course this is typically at the hotel that I stay in about once a month for 3 day at a time for work. The front desk pretty much knows me and know that I am fairly low maintenance."