Connect 66i to Instinct Watch? ANT+?

This was a feature with the InReach Mini, and I believe the Explorer too. But when I try and connect the 66i to my Garmin Instinct watch it doesn't seem to do anything. Just says it can't find a compatible device. I checked the 66i specifications and it says Ant+ is in the device, so I can't see a good reason why this would not work. This page clearly says 66i and Instinct are compatible: https://www.thisisant.com/directory/gpsmap-66i

Am I doing something wrong, or is this just another feature that wasn't completed in time for the product launch? If so, Garmin folks, are you working on this along with the missing weather features?