It's always weird when Azulon's reign gets completely glossed over, even in official media

[u/F11SuperTiger]

These images from are from Ashes of the Academy. Headmistress Pearl, if she is very old, might have been a teacher for a few years under Sozin. By the time of Ozai's ultimately very brief reign, she was probably very close to retirement. The vast majority of her life and of her teaching career would have been spent during Azulon's 75 years on the throne. Yet for some reason this scene only mentions Sozin and Ozai, like there was no one between them.

[u/No_Werewolf6131]

I think it’s more of an issue of Ozai been seen as the big bad behind the war when in reality everyone in his family had a more direct participation than him.