My account has been compromised and is attempting to use it to log into other services of mine linked to this account. How do I force log out of all devices?
assuming you had a safe password that wasn't just guessed, it is likely you or someone you gave the pasword to gave it to or used it directly to sign in to other devices. also any users on your account that are not set to severly limited access may sign in. Have you changed your password? go to xfinity.com, accounts, and then users. any users listed there?