When an employee submits an address change using the Self Service - Edit Address workflow, a notification email is sent to confirm the update. In some cases, the subject line of this email displays a data tag instead of the employee's name.
Rather than showing the employee's name, the subject line displays the following:
Address updated for <DATA Activity="keyLookupActivity1" FieldName="SelectHR\Person.Details.Informal Name"/>
This is a known development issue. If you are experiencing this, please contact our support team so we can log this against your account and keep you updated on a fix.