Unable to access inactive account

Recently whenever I tried accessing my email I keep getting an error saying that I need to reset my password. Then, it says I need to work with the primary account manager to resolve this. Problem is, #1 this is an old inactive account and #2 this person is now dead and I have no way to get into their account. The password they left doesn't work and the recovery option sends a code to a long since deactivated phone. This email password has always worked fine until some screw up at xfinity decided that people should reset their passwords for "security reasons" which is not how password security works by the way. Passwords should only be reset if they've been compromised not just cause an arbitrary length of time has passed. Many people on the forums are recently having this problem as i've read as well. It was a nightmare getting access to my current account and email since tech support on the phone doesn't tell you everything you need to do. However, that email address is nearly useless to me as I don't really use it and use my old email address I've had for many years. I also have access to an account that has this old account linked to it but no way to get access to it. You have a nice button for switch accounts that I assume is to switch to the other account linked but it does nothing except send you back to the page you were just on. I need access to this email address.