Okay - perhaps I'm stupid - but I simply don't get it 🙂
Anyway - the problem is in fact more down to filtering for me, so I'm trying another way around it, that seems to work - by using the "Author filtering" instead:
The filtering works (the User is set to be Author in 2 articles - but I can't get the output right:
I can tell that there is a difference in the type of "parenthesis" from the one I copied from the Documentation, versus what
is generated via the button
Probably remnants of settings from a very early install of Articles Anywhere.
You can change the "parenthesis" (= Data Tag Characters) in the Articles Anywhere system plugin settings.