An App ID with Identifier 'com.abc.efg' is not available. Please enter a different string

I found the solution from Apple developer forums.

Apple has just updated their Dev Center CGU. It seems that the app extension bundleId is stricter.

if your app bundleId format is : com.my.app

your app extension bundleId now have to be : com.my.app.XXX

Creating new appID and provisioning profile fix the issue.

Check this link https://forums.developer.apple.com/thread/15712

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