Possible reasons for your enrollment being rejected include: You have already enrolled. The User Id you selected is already taken. The ZIP code entered does not match the ZIP code on your account. You can only have one account per User Id unless you have multiple accounts linked together in our database. Please set up a new User Id for each account, or contact your local Customer Center and ask to have your accounts linked.If you have addressed each of these issues and are still unable to enroll, contact your local Customer Center.