Sharing new location with existing user

Installed camera in new location and now need to share with same user from another location. Cannot find a way to do that in my app. I enter same email address used to share the first location but there is no indication that he has a ring account and the invitation that he gets requires him to set up a new Ring account. Is this a bug in the Ring app? According to instructions I should have the option to add an existing shared user to my other locations without requiring them to set up a new Ring account. Any help appreciated!