Signals Notebook: External List Source shows an error message when attempting to 'Fetch Example Data'

The following error message is seen when using 'Fetch Example Data': "The External Source returned an error. Status code: 401. Description [status:401, message:null]"

Resolution: This error message indicates a problem with authentication in the external source. Ensure the API key is correct and up-to-date and that the user it was generated for has the correct access privileges to be the requested data in the external source.