This error can occur when you have multiple applications reading from an endpoint using the default ($Default) consumer group. As a best practice, you should create a consumer group per consuming application. When you right-click and monitor in VS2019 or VS Code, it uses the default consumer group. So what you can do instead is use the
az iot hub monitor-events command and use the
-c flag to specify a consumer group you created. You can create one in the portal in the Built-in endpoints blade:
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