An App Id with Identifier 'Com.Example.App.Extention' Is Not Available. Please Enter a Different String

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

You need to provide your Unique bundle ID which is used for your app-building and distribute on the app store.

As above "com.app.myappname" is a sample App Id you need to replace with yours like =>

com.yahoo.mailapp

Now next question is how to set your App ID?

You can set it through your ionic project from Visual Studio Code or from XCode itself.

Set App Id from the ionic project (Visual Studio code or any other dev tool):

1. Open Your Config.xml file and set :

   

After doing this build your app and open it in your XCode and you will get your updated App Id in your XCode.

2. Now generate codesign for provided App Id.

Link -> How to generate code sign?

Set App Id through Xcode:

1. After building your app open your iOS generate code in Xcode.
2. Select Project -> General Tab -> Change your app Bundle Identifier

Hope this will help you to build your app.

An App ID with Identifier 'com.example.app.extention' 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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