An App ID with Identifier 'com.example.app.extention' is not available. Please enter a different string

Question

I have tried to add extensions to my iOS app, both a today extension and an Apple Watch app. My app has been completed however when submitting my archive I got the error bas

Answer 1

Xcode to 7.3

I encountered the same problem after upgrading from 7.2 to 7.3. In my case the fault was a hyphenated domain and AppID which worked in the past but stopped working in XCode 7.3. I replaced the hyphen with a space in AppID (in Membercenter) and it worked again.