Guys I was having the same issues and I figured it out!!!
In beta, in order to get this you had to be HONORED with THE AVOWED.
Now in live, you have to be REVERED with THE ASCENDED.
Well guess what never got changed on the backend!
That’s right, they never changed the backend requirement for what you need in order to unlock the legendary. I can confirm that after I got honored with the Avowed, it unlocked for me.