Troubleshooting tips for not receiving Apple Watch fully charged notification on iPhone include turning on Charging Reminders in the Watch app.
Ensure proper setup for sleep tracking and charging reminders in both Health and Watch apps to resolve the issue.
Check iPhone settings to allow notifications for the Watch app and restart both devices to address any temporary glitches.
Additional solutions include updating all devices, erasing and restoring Apple Watch from a backup, and resetting iPhone settings to default if the problem persists.