When connecting a Resume.com account with Indeed, you do not need to use the same email address.
If you linked your Resume.com account to the Indeed account and you were already logged into Indeed, it is possible that the email addresses on each account do not match. If you receive this error, try going to Indeed.com and logging out of your account there. Then when logging in again, try using a different email address that you may have an Indeed account under. This can help you locate which Indeed account your Resume.com account is associated with.