Consider user with Device A(Android) logged in with Google Play game services . Now same user with Device B(iOS) wants to login . As GPGS is not supported for iOS how can we link his Apple ID login to his GPGS login? Anyway to do this by accessing the email id?
Since both sign with Google play game service and sign with Apple are associated with specific hardware, you cannot Link Apple account on android device. As a workaround, you can first login with a universal login mechanism (such as Email, Facebook or PlayFab) on your Apple device, because they're not associated with specific hardware, then you can call Link Apple API to link the Apple account to the user's PlayFab account. You may refer to Set up Sign In with Apple for PlayFab - PlayFab | Microsoft Learn for how to set up sign in with Apple.
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