SummaryWhen using merge fields in a Salesforce email template, these fields are empty in the final output file.
SolutionThis is by design: email templates the tags located with Drawloop will not work. As a workaround, it is possible to create a template with tags connected with Drawloop. This would be done by implementing the word document to become the email template. The email body would be created just like a normal email within Word and tagging would be done just through the normal tagging process. In the email delivery option you will want to make the word document the email template chosen.
For more information, see Email templates in Nintex Help.