Connection problem

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I try connect to photon cloud using PUN2, but it returns an error:
OperationResponse 230: ReturnCode: 32756 (Cloud public / Region 0/* is not available.). Parameters: {} Server: NameServer Address: ns.exitgames.com:5058

My code use following line for Connection:
PhotonNetwork.ConnectUsingSettings();
after fail, my system makes second attempt and same code connects correctly.

Old PUN works fine with same settings. Whats a problem? whats is region 0? Or it is photon bug?
Thanks.