In a local 2-player mobile game, the winner needs to have there score incremented on the leaderboard, however, the winner may not be the device owner (person authenticated and logged in).
If they had an option to enter the name of the winner when the game finished, how can we have that amended to a leaderboard?
Yes, that's possible. In order to update the second player's statistics, you'd need them to log in. There are a few options available to support that, so pick the one that makes the most sense.
The pre-built SDKs don't make a local multiplayer scenario trivial, though. By default, subsequent login calls will overwrite your SessionTicket, effectively changing the player context of future client API calls. The SDKs are open source, though, so it should be possible to customize for your scenario.
You can also heavily leverage cloud script in this kind of scenario. Once you know a player's PlayFab id, you can provide that to a cloud script function and have it update that player's record.
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