Exactly what it says in the title.
I'm on Primal and whenever I queue up for Ranked (at Diamond 5) the Average Wait Time starts at "Less than 5 min", but it just doesn't find a match, with the "Average Wait Time" slowly ticking up to match the Time Elapsed.
After anywhere from 20 to 50 minutes I get an error that says "Unable to register. Duty registration has been cancelled".

What's going on here? Is it just completely dead? If so, why is the estimate giving me false hope?

Kind of frustrating since I was hoping to try to get to Crystal again in the few weeks before 6.2 but every time I try I just end up wasting a bunch of my limited free time.