What does it mean when the listener for Event Hub Trigger in Azure Functions fails to start?

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When the listener for Event Hub Trigger in Azure Functions fails to start, it means that the function app is unable to establish a connection with the Event Hub, or that the credentials provided for the connection are invalid. This can occur for several reasons, such as network connectivity issues or incorrect configuration settings. To resolve this issue, you should review the configuration settings for your function app and ensure that the connection string for the Event Hub is correct. You may also need to check the network settings for your Azure environment to ensure that the function app can access the Event Hub.