In the WWDC2020 "Keep your complications up to date" session, Mike shows that you have to create an App ID that ends with ".watchkitapp.complication" in order to support PushKit. Any time I try to add ".complication" to the end of my App ID, it gives an error: An App ID with Identifier 'com.x.y.watchkitapp.complication' is not available. Please enter a different string.

My standalone watchOS app is trying to read from the calendar via EventKit. It seems to only see local calendars though, not any of my iCloud calendars. Do I have to do something special to be able to view the iCloud based calendars?

When sharing a watch face that includes complications, the CLKComplicationDataSource method gets called. When switching to WidgetKit, is there an equivalent method that gets called?

I see that if I go to the CloudKit web services pages that they're in an archived area. I've got (really old) PHP code that processes data and then uploads it to a public container. Should I be changing to something different?