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1. Check the job logs: The job logs may contain additional information about the error. You can access the job logs by going to the job page in the Azure portal and clicking on "Logs" in the left-hand menu. Look for any error messages that may provide additional context.
2. Test the credentials using Azure Storage Explorer: You can use Azure Storage Explorer to test the credentials you are using to access the external storage location. If the credentials work with Storage Explorer, then there may be an issue with the configuration of the event trigger or job.
3. Check if the account key has been regenerated: If you have recently regenerated the account key for the storage account, ensure that the new key is being used in the job and event trigger configuration.
4. Check if the storage account is in a different region than the job and event trigger: If the storage account is in a different region than the job and event trigger, there may be a delay in syncing the permissions. Wait for a few minutes and try again.
5. Verify the event trigger configuration: Ensure that the event trigger is configured correctly, with the correct storage account and path specified. Check that the trigger is enabled and that it is set to the correct event type.
6. Check if the file system is correctly configured: If the external storage location is an ADLS Gen2 file system, ensure that it is correctly configured. Check that the file system is not in a deleted state, and that the file system permissions are correctly set.