As of 2022 on Yelinak TLP there is a minimum level of 16 to complete the quest. At level 15 Ithvol told me to go kill more rats, so I tried skipping him, but then the Dragoon in LFay told me he had no need for it... then I went ahead and tried the gnome lady in Steamfont and she told me to kill rats etc.
Leveled to 16 (no other faction work) and was able to complete the entire quest no problem.
Also, as a fresh Troll Shaman, I had to do the faction quest 1 time. So before you start running to Neriak, go to East Freeport and say "I am devoted to Innoruuk" to Saxarivza Zaxun, and get the letter to deliver to Perrir Zexus in Neriak for faction.
Edit: just tried something with another troll shaman- if you have a Guise of the Deceiver (DE illusion mask), using that will take you from apprehensive faction to amiable, and you can do the quest turn ins with no pre-faction questing.
Edited, Jun 29th 2022 10:00am by Xanfi