A few weeks ago I obtained the Enkidu pet from the Gilgamesh trial in Duty Finder. I learned and summoned him a few times, and haven't brought him back out since.

Yesterday, I was placed in the same Gilgamesh trial that drops Enkidu. This reminded me that I obtained Enkidu on a previous night. When I navigated through my Companion tabs, I discovered that I no longer have the Enkidu.

I have no clue why/how a companion would suddenly be missing that I obtained a week+ ago.