@sri bet​ :

The error message suggests that there may be an issue with the configuration of the Azure Key Vault or the authentication process. Here are some possible solutions:

1. Check that the Azure Key Vault is properly configured and accessible by the Databricks cluster. You may need to provide the appropriate access policies for the Databricks service principal in the Key Vault.
2. Ensure that the credentials used by Databricks to access the Azure storage account are valid and up-to-date. You can verify this by listing the files in the storage account using Databricks.
3. Try setting the fs.azure.account.key.<account-name>.dfs.core.windows.net.<your-container>.oauth2.client.id and fs.azure.account.key.<account-name>.dfs.core.windows.net.<your-container>.oauth2.client.secret configuration properties explicitly in the spark.conf object to authenticate with the Azure Key Vault.
4. Check the Databricks cluster logs for more detailed error messages or warnings that could provide additional insights into the issue.

I hope this helps! Let me know if you have any other questions.