Thok ast Thok Extreme is two expansions old. On top of that, the newest expansion just came out and most people are either doing the newest expansion content or doing the MSQ to catch up to do the new content.

Old side content, like Extremes, Diadem, Eureka, etc. are not populated enough right now to use DF for them. If you really want to do such old side content, you have to run them with your FC and/or set up a Party Finder.