FusionAuth 1.69.0 introduced changes to how Apple identity provider keys are handled. If your Apple identity provider was configured before upgrading to 1.69.0, you may need to update the key configuration.
To resolve this issue:
Review the 1.69.0 migration guide for specific details about Apple identity provider key changes Navigate to your Apple identity provider configuration in the FusionAuth admin UI Verify that the signing key is properly configured and valid If needed, re-import or reconfigure the Apple private key used for the identity provider Test the Sign in with Apple flow after making these changesThe migration guide contains detailed steps for addressing key-related issues introduced in this version.