Huawei WATCH 2 Faq page 14

8. In the Wear OS by Google app, go to Settings > Block app
notifications to see if notifications from any Apps or SMS messages have
been blocked.
9. Check that the time is calibrated properly on the watch. If the time on
your phone is later than that on your watch, notifications will not be pushed
to your watch. You can manually synchronize the time on your watch from
the phone to avoid this issue. On the watch, go
to Settings > System > Date & time > Automatic date & time, and
select Sync from phone.
10. If the issue is still not solved, uninstall the Wear OS by Google app from
the phone and reinstall it from app market and grant the app all
permissions. Restore your watch to factory settings and re-pair it with your
phone. During the pairing process, make sure that you grant all notification
permissions. If the issue persists, repeat steps 1–8.
Why doesn't my watch vibrate or ring when I
receive an incoming call notification?
Check that the watch is attached firmly to your wrist. If the watch detects
that it is not being worn, it will not ring or vibrate when there is an incoming
call. If your watch does not vibrate when it is being worn, check the
following settings: