Q: Apple Watch Mirror Notifications From iPhone Toggle Not Working

Hi

First try the following steps, which should help:

• Toggle the Notifications setting on and then off again for each affected app, allowing a few moments in between.

• Close the Watch app and then restart both your iPhone and your watch:
  • To close the Watch app on your iPhone, double-click the Home button, then swipe up on the Watch app preview.
  • Turn both devices off together, then restart your iPhone first;
    • Restart your iPhone, iPad, or iPod touch - Apple Support
    • Restart your Apple Watch - Apple Support

If the issue then persists, it may help to unpair and re-pair your watch:

• The Watch app on your iPhone takes a backup of your watch automatically when unpairing via the app. Choose to Restore from Backup during set up. Most data and settings will be restored, with some exceptions (eg Apple Pay cards, passcode).
  • Unpair your Apple Watch and iPhone - Apple Support
  • Set up your Apple Watch - Apple Support

What version of iOS is installed on your iPhone?

The following further steps may help:

• Unpair your watch using the Watch app:
  • Unpair your Apple Watch and iPhone - Apple Support
• Make an encrypted backup of your iPhone:
  • If using iTunes, be sure to choose the option to Encrypt iPhone backup.
  • How to back up your iPhone, iPad, and iPod touch - Apple Support
• Restore your iPhone to factory settings using iTunes (installing a fresh copy of iOS):
  • Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings - Apple Support
• Restore your iPhone from the encrypted backup;
  • Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
• Pair your watch, setting it up either as a new watch or restoring from backup:
  • Set up your Apple Watch - Apple Support

If the issue then persists, I suggest that you continue your dialogue with Apple Support:

• Contact - Official Apple Support