Solution:
1. Please check whether the message notification function in the realme Link APP is turned off.
2. Check whether the realme Link APP does not have permission to get notification permission.
3. Check whether the watch and phone Bluetooth are connected.
4. The realme link APP does not have permission to run in the background; the notification function needs to keep the realme link APP running continuously in the background.
5. Please check whether the Do-not-disturb mode is turned on, when do-not-disturb mode is turned on, messages are not alerted and do not vibrate.