My Subscribed Calendars on my Mac's Calendar app are not syncing to my iPhone and iPad Pro running iOS 11 B2 (same with B1). However they are still syncing to my iPad Air on iOS 10. I have BRed but would like to hear if others are seeing the same thing since there is no mention of this in the release notes. I have tried deleting and resubscribing and no go. If I change the color it changes on my iDevices but no info syncs to the actual Calendar.