WatchOS - Locating the MAC address of an Apple Watch
Step by step instructions for locating the MAC/WiFi address of a WatchOS device that includes a WiFi chip.
1. Locate and tap the Watch app.
Note: Only select Apple Watch products have WiFi available. These instructions will only work for Apple Watch/WatchOS devices with WiFi built in.
2. Tap General.
3. Tap About.
4. The WiFi/MAC address is listed by the Wi-Fi Address section.