Here are some methods to try in order of what works most effectively.

cycle your Apple Watch.

Restarting your Apple Watch and iPhone can fix many common connection issues.

Re-sync your Apple Watch.

Check your Apple Watch and iPhone are correctly connected and working properly.

check that you’re wearing your Apple Watch correctly.

Check you’re wearing it carefully on your wrist so the sensor detects you correctly.

Turn off Wrist Detection.

Switching off wrist detection will circumvent the sensor.

Go toSettings>Passcode>Wrist Detectionto turn itOff.

Turn off Airplane Mode.

Switch the mode off to restore the connection.

Turn off Do Not Disturb Mode.

Check the Apple Watch’s Control Center to confirm both this and Airplane Mode are switched off.

Disable Cover to Mute.

Just like Do Not Disturb, Cover to Mute silences notifications.

Turn on mirrored notifications.

refresh your Apple Watch software.

Reset your iPhone web connection configs.

Sometimes, this can fix connection issues.

If your iPhone is unlocked, your phone might be on silent mode with vibration disabled.

Tomake your iPhone vibrate, go toSettings>Sound & Haptics>Vibrate on Silent.

You could have Do Not Disturb or Airplane Mode enabled.