The button "Connect" does nothing. There is some information in log file:

PlayFabException: Must be logged in to call this method
at PlayFab.PlayFabMultiplayerAPI.FindLobbies (PlayFab.MultiplayerModels.FindLobbiesRequest request, System.Action`1[T] resultCallback, System.Action`1[T] errorCallback, System.Object customData, System.Collections.Generic.Dictionary`2[TKey,TValue] extraHeaders) [0x0002f] in <f587a5ed09d74d0caa0132e47dba1579>:0
at ZPlayFabLobbySearch.FindLobby () [0x0000d] in <35c0f7aa1999477788815a7bf78200d7>:0
at ZPlayFabLobbySearch..ctor (ZPlayFabMatchmakingSuccessCallback successAction, ZPlayFabMatchmakingFailedCallback failedAction, System.String searchFilter, System.Boolean joinLobby) [0x00032] in <35c0f7aa1999477788815a7bf78200d7>:0
at ZPlayFabMatchmaking.FindHostSession (System.String searchFilter, ZPlayFabMatchmakingSuccessCallback successAction, ZPlayFabMatchmakingFailedCallback failedAction, System.Boolean joinLobby) [0x00012] in <35c0f7aa1999477788815a7bf78200d7>:0
at ZPlayFabMatchmaking.FindHostByIp (System.String hostIp, ZPlayFabMatchmakingSuccessCallback successAction, ZPlayFabMatchmakingFailedCallback failedAction, System.Boolean joinLobby) [0x00030] in <35c0f7aa1999477788815a7bf78200d7>:0
at FejdStartup.JoinServer () [0x0013e] in <35c0f7aa1999477788815a7bf78200d7>:0
at FejdStartup.OnJoinStart () [0x00000] in <35c0f7aa1999477788815a7bf78200d7>:0
at UnityEngine.Events.InvokableCall.Invoke () [0x00010] in <eecd1e320c5f437580363c559779c2fe>:0
at UnityEngine.Events.UnityEvent.Invoke () [0x00022] in <eecd1e320c5f437580363c559779c2fe>:0
at UnityEngine.UI.Button.Press () [0x0001c] in <aabc13c39ca44b2b8035622f0393aa98>:0
at UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) [0x00009] in <aabc13c39ca44b2b8035622f0393aa98>:0
at UnityEngine.EventSystems.ExecuteEvents.Execute (UnityEngine.EventSystems.IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) [0x00007] in <aabc13c39ca44b2b8035622f0393aa98>:0
at UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) [0x0006c] in <aabc13c39ca44b2b8035622f0393aa98>:0
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
UnityEngine.EventSystems.ExecuteEvents:Execute(GameObject, BaseEventData, EventFunction`1)
UnityEngine.EventSystems.StandaloneInputModule:ReleaseMouse(PointerEventData, GameObject)
UnityEngine.EventSystems.StandaloneInputModule:ProcessMousePress(MouseButtonEventData)
UnityEngine.EventSystems.StandaloneInputModule:ProcessMouseEvent(Int32)
UnityEngine.EventSystems.StandaloneInputModule:ProcessMouseEvent()
UnityEngine.EventSystems.StandaloneInputModule:Process()
UnityEngine.EventSystems.EventSystem:Update()