Witherd Army - Not able to start

I’m attempting to do some Withered Army Training from Legion on this character. I’ve done the scenario several times in the past (even unlocking the rare drop mount). I have about 1.2k Ancient Mana, way more than the 400 required to go in. The world quest is shown, I have not done it this week. I’ve fully done the Suramar storyline and all that. There are no other WQs around her that would maybe be interfering with phasing that I can see.

Thalyssra has no dialogue options when I speak to her at all, I cant even buy from her shop that she should have available. Anyone else having this issue at all?