So, working as expected then - correct, it wouldn't show if someone hasn't made a name change as there is no name change history.
Over to you @Murphman
Nope - turned on for everyone.
Can you provide the link to the profile you checked please?
Post it in https://www.ynwa.tv/forum/69-my-own-personal-testing-forum/
I'll play along, because if something isn't working then I'll need to check why it's not working - are you saying that when you view a user's profile and click the indicated button that it doesn't show you the display name history of a user?