Hi john.rose.dev,
The article is several months old, and I am not sure of the current state of this. But at the top, it states:
Important Note: This article takes advantage of the Groups feature that is currently in beta testing. To get access to this feature, please, follow the instructions on the New Beta Program for Authorization Groups announcement.
Sorry, but I don’t know the status of this feature. Did you try the link for joining the beta?
John