Yahoo mail not supporting + added to email address, locked out of hn account

I added an email address to my hn account, using xxxxx+hn@yahoo.com. I am unable to remember my password, and Yahoo is not recognizing the +hn email address as valid so I can't receive the password reset email. I verified by sending myself an email to the same account, which bounced back.

HN does not verify the email address on the profile, and I assumed incorrectly that Yahoo supported this format.

Is there any way I can have the +hn removed from my hn account?