A 401 error in Databricks typically indicates an authorization issue. The system cannot authenticate your request due to incorrect or missing credentials. Here are some common causes and solutions:

Possible Causes:

• Incorrect Personal Access Token (PAT): Ensure that the PAT you’re using is valid, has not expired, and has the necessary permissions for the actions you’re trying to perform. You can create or manage your PATs in the Databricks user settings.
• Incorrect Azure Active Directory (AAD) Token: If you’re using AAD authentication, ensure your token is valid and has the required permissions. You may need to refresh your token or re-authenticate.
• Insufficient Permissions: Check if your Databricks user or service principal has the required permissions to access the resources you’re trying to use. You may need to request additional permissions from your administrator.
• Network Issues: Occasionally, network problems can cause authentication failures. Ensure you have a stable internet connection and try again.

Troubleshooting Steps:

1. Double-Check Credentials: Verify that you’ve entered your PAT or AAD token correctly in your code or configuration.
2. Refresh Tokens: If your tokens have expired, refresh them by reauthenticating.
3. Verify Permissions: Confirm that your user or service principal has the necessary permissions to perform the requested actions.
4. Check Network Connectivity: Ensure that you have a stable internet connection and that no network issues prevent authentication.