I am trying to access my old iPhone 6, which i have factory reset, and I am met with an activation lock. The phone is locked to my old apple account, with an @education email. I still have access and control over the email, and I know the email's password, though not the password linked to the apple account. I have tried to reset the password at iforgot.apple.com and I am told that "This Apple Account is not valid or not supported.".
Please help! I would appreciate any help at all!