I was hoping to add support for SharePlay, but my app is not Universal, because it is around 5 years old. The macOS and iOS versions have different bundle ids, and making a universal app would be a bag of hurt (loss of reviews, migrating data in sandboxed environments and lots more).
Am I correct that SharePlay will only work with a single bundle id? I was hoping by simply choosing the same activity type in each app they could connect, but I don't really see how it can given the activity type is hard coded, rather than configured in the Info.plist.
If this is the case, it seems like a lost opportunity, not only for "legacy" apps like ours, but also for anyone who might want to work between apps in an app group. Presumably rather than hard coding the activity type, it could have been registered as an Info.plist configuration or entitlement, allowing apps to partake with different bundle ids, the same way it works for iCloud for example.