HBO GO is asking me to register again when I already have a profile
When you sign into HBO GO, you might be asked to register again if your TV Provider requires it. You'll need to enter a new HBO GO ID, but the email field is optional. The HBO GO ID is a unique name associated with your HBO GO profile and is not used to sign in to HBO GO.
Note: If you continue to get prompted to create a new profile, please email HBO GO customer support.