Apple Sing In on VisionOS

Hello. On my game I have Apple Sing In option that is required to keep user high score, show name in game, and for other app functionality. Game is made on Unity.

Now when I'm trying to port the game to Vision Pro, Im getting error that Authentication is not supported on this platform. It may be the plugin issue that I'm using(not sure yet). But I also didn't find any documentation for native code ( so I could make plugin that unity game could use).

Question: does VisionOS support Apple Sing In in the applications? if yes please give me some resources. if no - is there any plans to add that functionality?

Thanks.