Authenticate with Firebase Using Apple Sign-In
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Open your firebase console.
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Go to Sign-in method in Authentication.
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Go to the Apple and enable apple sign in.

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In Xcode, select the Signing & Capabilities tab, and add "Sign In With Apple" as a new Capability then select a team on the Code Signing section.

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This will generate and configure an App ID in the "Certificates, Identifiers & Profiles" section of the Apple Developer portal.
Important: For iOS authentication setup and URL scheme configuration, please refer to our comprehensive guide. This step is crucial for enabling Apple Sign-In in your iOS app.