Huawei WATCH 2 Faq page 9

4. Check whether your watch is in Theater mode or Airplane mode. In these
two modes, your watch will not receive incoming call notifications, message
notifications, or notification cards.
5. Check that the Wear OS by Google app is running in the background. Add
the Wear OS by Google app to the list of protected apps on the phone to
make sure that it continues to run in the background when the phone's
screen goes off.
6. Check whether notification permissions and SMS messages have been
disabled on your phone.
(1) On your phone, go to Settings > Apps > Wear OS by Google >
Notifications and enable Allow notifications.