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I have tested a similar scenario both locally and on our demo here and it worked correctly at mu side. One possible reason for such behavior is not correct implementation of the signalR hub. - You can refer to our demo service here where a sample code for such service is implemented - https://github.com/telerik/kendo-ui-demos-service/blob/e92876af15681a7689a095deb15541e884b70a8f/demos-and-odata-v3/KendoCRUDService/Hubs/MeetingHub.cs
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