InfoPath Dev

Hello, I need to send an email from a workflow using the email address or the user from the form. I tried “Workflow lookup for a user or group” option from the “To” tab in “Email” section, but that is not working. I assume the problem may occur because Designer 2013 understands the email address or the user as a string. (The pic is attached).I use SharePoint Designer 2013. How can this problem be solved? Thanks in advance!

Is the data in the promoted column an email address? If so, I'd expect this to work.

In the previous example the data in promoted column is a user name, in this example it is an email address. Just for information: I get the users and the emails addresses from external data source (an external list).