For whatever reason non of my shield heals were counting for the endeavor. Initially I thought it was because i was in Jelly mode on the Cindarian, but it wasn't that as I was able to get that to work. The only thing that it seemed that it could be was the temporary hit-points that I was getting. I took off one source of them and drew a bunch of aggro. Once the T HP was gone the endeavor finished.
Please let me know if you need combat logs or a video and I can create one
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