ConnectIQ SDK for mobile - iOS 16 - launches Garmin Connect - doesn't present device selection or call back app

I've followed the instructions as per these guidelines: https://developer.garmin.com/connect-iq/core-topics/mobile-sdk-for-ios/

However, when launching Garmin Connect, I do not get an expected device selection, nor does the GCM call back my app.

It opens as if I've tapped on the GCM home screen icon - launches, does the standard sync, and then nothing.

I've tried both a cold open (force quit GCM to force a fresh launch), and leaving GCM running in the background.

Can anyone shed some light?

(Looks like this might be an on-going issue when looking at previous threads, but would love clarification)