Not quite. I have a source article (in group A). Let's call this article "Jon" Article "Jon" is replicated (linked) in Group B. The source article has tag Erica A and Erica B (therefore the linked article also has them). Now, when I a reader in group B and I click the Erica B tag (from another article in Group B that has that tag), I should be able to see the linked article Jon.. but I dont see it.

Erica - Would like to clarify, are you referring to Users & Security > Reader Groups (or) Groups in Tags? Need more clarity on the scenario being conveyed.

The understanding is there is an Article with tags (A,B) and either of these tags (A,B) are mapped against the Groups(A,B). Are you referring to that group name also should be displayed against the tags associated within the article?

Feel free to add more context on the same. Thank you very much for your feedback.