Last night I was the problem. I decided to unlock Scholar from my Lv60 Summoner, did the job quests and decided to test it out in a roulette, hoping to roll something not too challenging to test it out a little. I rolled The Vault of all things, which made me die a little inside.
Told the group that it was my first time on Scholar, but main WHM so Im used to healing. It was a mixed run, went OK until the 3rd boss where I wiped us twice before getting a messy clear because I was looking at my hotbars and trying to grasp how the shields work.
Anyway, I want to give a shoutout to that group, especially our tank, for being patient, encouraging, and qhelpful party.