Added new account to my battle.net but can't use raid/pve obtained titles

[Lestrang]

I added a new account to my battle.net account today, i am able to use 100% of the mounts i obtained on my main, i have all achievement mounts, i have SOME titles, mainly non PvE titles, like Ambassador, associate professor, the hallowed, the wakener
But no pve titles like firelord, dragonslayer savior of azeroth and such.. I tried to use a /settitle macro but it says i dont own that title even though it shows in the achievement page.. I had a thought that maybe as i unlock those raid tiers (gain levels) the titles will be available, but i think this is a very weak case

Anyone got any idea?

[Volibear]

You can't use PvE/raid-based titles until your character has reached the appropriate level (eg Kingslayer/Light of Dawn at level 80).

[CR77]

Some are level specific, Firelord for example probably requires the toon to be 85+