Hi,
The following solution worked (at least for me) tested on several Apple Watches (series 4, watchOS 5.1.1 and 5.0.1)
(iPhone)
1. Unpair Your Apple Watch
2. Settings - Mail - Notifications - Allow Notifications - Sounds - Vibration: Choose one from the standard vibrations (I am using Accent)
3. Settings - Mail - Notifications - Allow Notifications: (Toggle ON), Banner style: Temporary, Alerts: All 3 styles ON.
4. Pair Your Apple Watch (You can restore from backup)
5. My Watch (iPhone App) - Mail: Mirror my iPhone
(On Apple Watch)
Settings - Sounds and Haptics: Haptic Alerts toggle ON and chose Prominent
Reboot Your iPhone and iWatch.
Please let me know if this solution works for You.
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