Is it possible to obtain the sessionID associated with a message sent to a Azure Topic/Subscription within the Azure Function that was triggered by the message?

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Yes, it is possible to obtain the session ID associated with a message sent to an Azure topic/subscription within an Azure function that was triggered by the message. This can be done by accessing the "SessionId" property of the "ServiceBusMessage" object that is passed as a parameter to the function.

Here's an example of how this can be done in C#:

public static async Task Run(ServiceBusMessage mySbMsg, ILogger log)
{
    string sessionId = mySbMsg.SessionId;
    log.LogInformation($"Session ID: {sessionId}");

    // rest of the function logic
}

The session ID can then be used within the function to perform any necessary operations based on the message it is associated with.