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.