Please help me find Wrathion πŸ™

I have completed Dragonflight on other character. I created an alt, lvled him in BFA and went to TWW. Now when he is lvl 80 I want to farm rep with black dragons, but they are just not there! There is only Osoria in the citadel and ahe don’t want to speak with me. Where are they? Please help me find them πŸ™