Yes, we can confirm that the 2-in-1 Charging Dock for the Apple Watch and AirPods is compatible with the iPhone 15 Pro Max. 

Please note: when connected to an iPhone 15 for charging, it is limited to 1W. We recommend connecting the Charging Dock to a Thunderbolt port or Power Adapter to achieve full charging speeds. 

(AirPods: 5W, Apple Watch: 2.5W)