I think they are having it deactivated because there is a hidden npc that they haven't shown yet but that showed up on the app.
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So they decided to just disable the whole damn thing. What is this Niantic
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Yeah Lady Efrideet showed up as one of the Iron Temple vendors. Oops...
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Which means she's probably there for Iron Banner whenever that drops, which means the whole vendors thing is likely going to be down until then. Morons, all of them.