One thing I noticed is that your field "Staff Duty Countries" wasn't registering as a geographic role - this is probably why you were having trouble mapping. I right-clicked it and selected Geographic role > Country/Region, then was able to create a simple map.I've attached a revised version of the workbook.
Sample Data.twbx 51.3 KB
Amber, thanks for taking the time to answer my question.
Helps a lot.