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[iOS] Social.localUser.Authenticate() is not called when user is not authenticated and GameCenter login pop-up is dismissed



How to reproduce:
1. Open the attached 'New Unity' project
2. Switch Platform to iOS in Build Settings
3. Build for iOS and open the Xcode project
4. Deploy Xcode project to an iOS device without being logged into GameCenter
5. Click on the Authenticate button on the screen
6. Observe that the following message is displayed 'SocialAuthenticateAsync is called'
7. If popup from GameCenter opens and wants you to log in, dismiss it
8. See the message that is called from the GameCenterLogin script in Unity: SOCIAL SIGN IN ERROR
9. Hit the authenticate button again

Actual result: 'SocialAuthenticateAsync called' message is displayed, pop-up window of Game Center does not appear
Expected result: 'SocialAuthenticateAsync' and 'SOCIAL SIGN IN ERROR' errors are being thrown

Reproducible with: 2018.4.29f1, 2019.4.13f1, 2020.1.9f1, 2020.2.0b7, 2021.1.0a1

Reproducible with:
iPhone XR (iOS 13.4.1)
iPad 9.7’ 6th gen (iOS 14.2)

  1. Resolution Note (2020.2.X):

    On certain platforms (including but not limited to iOS and tvOS), the callback is only invoked on the first call to Authenticate(). Subsequent calls to Authenticate() on such platforms results in no callback being triggered. This can occur if, for example, the user or the OS cancels the authentication operation before it has completed. Please ensure you test for this situation.

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