Azure Event Grid publish message error Not authroized (Code: 135)

Question

I have problem with publishing to Azure Eventgrid via MQTT.

I setup MQTTX to connect to evengrid. Messaging are comming in from other cliend, and I can read them with MQTTX.

But when I try to send message to Eventgrid via MQTT I get following error:

I have been added permission bindings for Subscriber. I read manual (https://learn.microsoft.com/en-us/azure/event-grid/mqtt-publish-and-subscribe-portal).

Where could be the problem?

Answer 1

Hello @Gašper Mis,

welcome to this moderated Azure community forum.

it seems you have your (two) device clients connected to the broker and one client can send a message and this one can receive that message.

So, the topic subscription works for this device client.

Now you try to send a message with this device client but that fails.

Double check the topic you use to send a message with the permission bindings:

It feels like a mismatch in that area, I get the same 135 error message when I misconfigure the publish topic.

For a full working example see this blog post. At the end you can find a link to video with a demonstration.

Did you enable the diagnostic settings:

You can check the table with a little more info:

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