I've been running into the same problem on an actual Vision Pro device during app launch. I've just updated to the latest Beta 5 (22N5297g) but it's still reproducible. Adding the Objective-C category on NSProxy seems to help. :pray:

Thanks for getting back to me. As you suggested, I've opened a bug report. Its number is FB14933714.

Hey, old post I know, but we've been trying to make this work with no luck so far and I was hoping to find help here. We have a small SharePlay utility app with a different bundle ID that we'd like to use on one machine with another one running the main app with its own bundle ID. When the main application launches the Group Activity and we try to join from the machine that has the utility app installed, nothing happens. We've tried to have a look through the Console for suspicious messages and found this entry that is logged right after trying to join: error 09:06:39.270338+0100 callservicesd -[CPApplicationLauncher _launchApplicationForActivitySession:options:completion:] Could not obtain URL for application with bundle identifier <private> Note that if we make the utility app use the same bundle identifier, things work as expected! Any help is appreciated!