I get the following error when creating workflows with Email action utilizing Sharepoint list columns in the Subject or Body of the email.
Send E-mail Event Message: The request failed with HTTP status 401: Unauthorized.; ServiceName: SharePointMetaDataService; ServiceGuid: f2545285-bb12-47c2-84dd-c7cf619b54cd; InnerExceptionMessage: ;
If do not use Sharepoint list columns then do not get the error.