So the entrance to Trial of the Crusader (and possibly Champion) is not working right now most likely due to phasing in that area right now, trying to go in and you get met with a invisible wall.
Yeah this issue was posted on wowhead, I found a workaround, if you can get a friend who has NOT done the questline on, you can have them party sync you, no matter where they are, it will phase you to the old phase. I was able to do the raids this way on my main.