Cant re-activate yahoo account?

[Ast Gamma rho]

So i was recently handed down an account for a group on my campus. the account unfortunately has not been used for a long time and has been deactivated however to recover the passwords from multiple social media platforms i need to have the passwords sent to this account. i tried to reactivate the account however every time i try to enter the code in the box it says there is a problem with your account and goes back to that page. i know its highly unlikely that i can get the emails that were previously sent to the account however all i need is to be able to receive emails so i can get the passwords from other websites.what can i do?