You can download Hue Essentials from AppGallery on your watch. See for more information: [HUAWEI Watch 3] How to download your applications - HUAWEI Community
- Download Hue Essentials on your watch. Open the (Huawei) Health app on your phone, go to the Devices tab, select your watch, and tap AppGallery. Search for Hue Essentials.
- Download Hue Essentials on your connected phone. Version must be at least 1.26.0 from Huawei AppGallery. Support for other stores like Google Play and Amazon Appstore will be added in the future.
- Open Hue Essentials on your phone, open the left menu, go to Settings, and enable the setting Huawei Watch.
- Now open Hue Essentials on your watch and your devices should appear.
See the following: Where can I download Hue Essentials for Wear OS?