Thanks again for your help!
Just to share an observation from debugging: in my case, the condition with com_content.article alone didn’t trigger the activity. What I saw was that the object value was com_content.form instead. So when I used the Is In operator with com_content.article,com_content.form, the activity was created correctly after adding an article. It seems that in my setup the object is sometimes form instead of article (even though it’s a standard Joomla article — I don’t really understand why).
I just wanted to mention this in case it helps explain similar cases. I’ve attached a screenshot of the working setup. I’m now ready to switch to CB Auto Actions as soon as flairs can be added to those activities.
Best,
Robert