What Azure regions has PlayFab deployed to?
If you mean "where can I deploy a custom game server", we're working on expanding to the full set of Azure regions, but you can always see the current list in your build settings in Multiplayer->Servers 2.0 in the game manager.
If you mean "where is PlayFab hosted", please see this thread for a complete discussion on that topic: https://community.playfab.com/questions/27834/aws-playfab-latency.html
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