After a bit more experimenting it seems like this is more a problem with push notifications. Incoming calls will ring if the App is actually running at the time, but I do not always receive a push notification of an incoming call if the app is not running. Other push notifications for the app (email, text, etc) work as expected, but push notifications for incoming calls only seem to come for one user (not the primary user) no matter what device is used. It's a bit of a pain, but is workable.
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