Hello!

I did not register at Olvia academy for the first season, then I wanted to check it out after April 9 reset, now I am unable to play the game. I can't do any quests, and the game is spamming me with "you are not currently enrolled as a student at olvia academy" message.

This happens with every -old, new- character and is very annoying.

What did you (attempt to) do to "check it out"? You tried to enroll? The in-game academy interface says enrollment was only up through April 8. Was that still enabled? 

I simply went there did 2 quests, the 2nd quest was a ceremony then i wanted to accept the Combat quest, it said "quest is already accepted" but i never got the quest, this happened with every single quest possible. Basically i was not able to enroll as a student, but i unlocked the Olvia Academy icon on top, so the game is trying to register me as a student but since it is disabled i am getting this quest. I tried everything, yet, this error occures every 0.3 seconds, and it is super annoying. No matter where I go or what I do, i get this error pop up.

I recommend sending a ticket to get direct assistance from a GM, as they cannot act on your account without the ticket.