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

I can see lot's of great answers,

I tried a few of them but no luck, finally I used "Use local signing assets" option to export ipa and it works for me.

Hopefully this will help someone.