So far I’ve checked out over 100 characters from Tan Lines and all have the 8hr task GO FOR GOLD which drops 1 Medal. The only characters not showing at are those from the current event.
But remember the task isn’t at the top of the task list so you’ll need to scroll down in the characters profile to find it. I have asked support if it could be put to the top. But this is the task your looking for, even although it doesn’t show the Medal icon it does drop 1.