I’m working on a kind of “notification observer” service which uses SignalR to collect connected users from an Angular application (this app uses Azure Entra as auth). This “observer” service would detect (by Service Bus or a call to the Hub) that a new notification has been created by other application for a specific group of user ids (list of Entra user ids, so GUIDs), and then it should be able to send this notification only to these specific users if they are connected to a Hub instance.