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The Azure Event Grid currently has Message Queuing Telemetry Transport (MQTT) v3.1.1 support with the current following limitations:

Will Message are not supported.
- Receiving a CONNECT request with Will Message results in a connection failure.
QoS2 and Retain Flag are not supported.
- A publish request with a retain flag or with a QoS2 fails and closes the connection.
Message ordering isn't guaranteed.
Keep Alive Maximum is 1160 seconds.

The Cirrus Link MQTT Modules are Sparkplug v3.0.0 compliant and will always include a Will Message as part of the client connection.

They cannot be used with Azure Event Grid until Will Messages are supported.