I changed my password but the old one still works.
All SEAS students, faculty, and staff have two accounts, a PennKey account and a SEAS account. Each account can have different passwords, although many people choose to set them to the same password to avoid confusion. Most SEAS services accept both passwords. If your passwords were the same and you changed one, both the new and old password will work for most SEAS services since both account passwords are accepted.
For example: if both of your passwords are "Password1" and you change your SEAS account password to "Password2", most SEAS services will continue to accept "Password1" since it is still your PennKey password.