Solution:
1. First, you should find Huawei Health app on the desktop. You just need to open the relevant permissions according to the prompt.
2. after opening, we need to find my > my device > add device and find our watch.
3. As long as friends click pairing, they will automatically search for Bluetooth devices, and watches and mobile phones will start pairing.
4. Finally, just wait for the pairing request and click "√".