Beautiful property, but my Ambassador Elite experience at The St. Regis Atlanta was extremely disappointing. I want to be fair at the start. The hotel itself is beautiful. The setting, pool piazza, terrace atmosphere, fountain, and overall feel of the property are exactly why someone books a St. Regis. When the experience is right, it really does feel special. I was also ultimately placed into a Metropolitan Suite on one of my stays, and that room was excellent. The problem was everything it took to get there. During mobile check in, the Marriott app showed that I had been selected for a suite upgrade. Before arrival, the property manually moved me down because that suite type was apparently not actually available. I understand that complimentary elite upgrades are subject to availability, but from the guest side the app created a clear expectation and then the property delivered something different. That made mobile check in feel misleading rather than helpful. The more frustrating part was the explanation I received at the property. I was told upgrades were effectively limited to one room category above what I booked. That was difficult to understand because my understanding of the Bonvoy Enhanced Room Upgrade benefit is that upgrades may include suites, subject to availability. At the same time, multiple suite categories were showing available for sale, which made the explanation even harder to reconcile. To be clear, my issue is not that every Ambassador guest should automatically receive a suite. My issue is that the upgrade benefit felt far more discretionary and difficult to access than it is marketed to be. Ambassador Service seemed to understand why the situation was frustrating, but at the property level it felt like I had to escalate, check live inventory, and repeatedly ask for clarification just to get the room reviewed properly. That is not the seamless luxury experience I expected from St. Regis. At this level, I expect the property to be polished, proactive, and consistent, especially when handling Ambassador Elite arrivals. Instead, the process felt defensive and unnecessarily difficult. There were parts of the stay that were excellent. The property is beautiful, some staff members were polite, and the Metropolitan Suite experience was genuinely memorable once I finally got there. But the arrival experience, upgrade handling, mobile check in confusion, and communication around elite benefits left a very poor impression. I would only stay here again if I booked the exact room category I wanted outright. I would not rely on mobile check in messaging or elite upgrade handling at this property.