Add help center users to groups before they have accepted their invite to help desk

Add help center users to groups before they have accepted their invite to help desk

Is there a way to add users to user groups before they have accepted their invite to the help center? I have segmented some knowledge base articles for certain customers using user groups. But I can't seem to add users to those groups until they have accepted the invite I'm sending.
This is a problem, because when the user accepts the invite and goes straight to the help center, they cannot see their group's resources. This is confusing for them. I have to see they've accepted and then add them to the group.

Any suggestions appreciated.