Well, I've heard from a few more hatchlings who still cannot complete this line of quests. Obviously something about them is borked. I, myself, was able to do them, however I know that my GF cannot, as well as at least 2-3 other hatchlings in Dragon Channel who have told me "Kerian and Avariatus won't give me anymore quests!" When I ask them if they've done all of the quests up until the Prime/Tempered Scale quest.
These quests are a Critical part of a new dragon's life and currently, these quests are not working as they should. If a dragon cannot get (and finish) the first Tempered Scale/Prime Scale quest, then they are not going to be able to get (and finish) the Second and Third quests in this line. My Suggestion is to make Vladtmordt's version of the First Scale quest Active again and let people get that quest until you find out what exactly the bug is.
Its not Just hatchlings who have already passed that point and trying to go back. Its New hatchlings too. Just yesterday, a hatchie named... um.... Nethsomething or Nathsomething, just started playing Horizons. He started his character the day before (or the day before that, I believe) and got Lv12 last night in New Trismus and he said that he was unable to get the quests either.
Please look over these quests a bit more, as they Are critical for any dragon who wants those Tempered/Prime Scales.
--Dhalin