"HP (alt) Marriott code 5105 is a secondary HP/HPE code, alongside the primary HPQ code and alt code 5444. HP's primary Marriott code HPQ is one of the most widely shared codes in FlyerTalk's publicly usable Marriott codes thread. The same risk profile applies to alt codes: Marriott's automated system has been documented to disable Mobile Key for high-risk codes, forcing front desk interaction. HP-heavy markets (Palo Alto, Houston TX) have heightened verification. No 5105-specific denial documented."

"I swear the front desk employees are trained to resist and encouraged to lie. They try to save the rooms for members with higher status or complainers. I've booked King rooms and they'll assign me a double or a queen. The first rep will tell me they're fully booked and there's nothing they can do. But once transferred to a manager, King rooms magically appear!"

"I get asked every single time on Government Rates/Per Diem Rates. (Multiple properties per month) I just know to keep my ID right there. Every once in a while they will try to photo copy it and then have to explain that isn’t allowed, otherwise I have no issues with it being validated."