Apple IOS 15.0.2 bluetooth not pairing with Garmin Venu SQ. It is possible to pair with Android, but not Apple's latest IOS.

Hello Lovelyday.  Please make sure to remove the watch from the Garmin Connect app on the iPhone and from the iPhone's Bluetooth menu as well.  Once you have done that, go ahead and hard reset the watch.

Instructions to Remove and Add a Device in the Garmin Connect App

To perform a hard reset, press and hold the power button on your watch.  Ignore the "Power Off" question and the assistance alert (if applicable) on your watch, just continue holding the power button pressed down until the screen goes blank.  Once this occurs, you may release the button.  Allow the watch to sit powered off for a few seconds, then you may power it back on by pressing and releasing the power button.

You will also want to make sure that you are running the latest version of the Garmin Connect mobile app on the iPhone and that the iPhone's iOS is up to date.

Installing the Latest Version of the Garmin Connect App

If this process does not work for you, please reach out to your local Garmin support team.

Garmin Product Support

My manual specifies an A and a B button.  i tried both, and neither delivers the above described result.  Perhaps you are thinking of a different product or this is a bot reply.

Hi, to do a hard reset you hold down the A button for about 10 seconds, past the emergency notification screen until the screen goes black.