What could be the reason for the absence of sign in with apple in Xcode?

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There could be several reasons for the absence of "Sign in with Apple" in Xcode, including:

1. Unsupported OS: Sign in with Apple is only available in Xcode 11 or later versions. If you are using an older version of Xcode, this option may not be available.

2. Incorrect project settings: Make sure that your project settings are properly configured to work with Sign in with Apple. Check that the necessary entitlements and capabilities are enabled in Xcode.

3. Apple ID issues: Sign in with Apple is associated with your Apple ID. Ensure that you have a valid Apple ID and that you are signed in to Xcode with that account.

4. Geographic restrictions: Sign in with Apple is not available in all countries. Ensure that your country is supported before attempting to use this feature.

5. Technical issues: Sometimes, technical issues can cause Sign in with Apple to malfunction or not appear in Xcode. If you have exhausted all other possible causes, try restarting Xcode or your computer to see if this resolves the issue.