[keybpo]

I have a similar situation, where I signed up with my main account and later changed IA's email to a more private address. It was the first email I checked on HaveIBeenPwned and it doesn't show up in this leak. The other couple IA accounts I have, whose emails and passwords are exclusive to them, they all show in this leak alright. I have no explanation to your situation but this was also my immediate though and I also wanted to give the opposite perspective.