Get currently used region?

Hello, I am using Photon Bolt v1.2.13c (free version). In settings I have selcted to use [best] region. But how can I detect what region was eventually used for creating a session? On forums I have found that I should use
PhotonNetwork.networkingPeer.CloudRegion
but in my project I dont have such class as PhotonNetwork!
I am creating session this way:
BoltMatchmaking.CreateSession(_selectedRoomId);

Thanks for any help

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