I have SharePoint Designer 2013, and I created a list workflow (2013). The recipients are stored in a list as DropDown field. When I create new item email are not going (either To or CC). Now surprisingly when I put the same code (CurrentItem:Approver) in body it fetches the correct email address.
When I keep myself in "CC" and Approver (Choice field value) in "To", TO field remains blank. But in the email body I get the correct email address.
When I manually provide the Approver email it works fine.