Check your messenger server connection: list every channel and category
A small test scenario: put in your server ID and get back the full list of its channels and categories. It confirms your access is set up correctly before you build the real automation.
Verifies server access before you start building anything real
Returns a ready list of channels and categories — you'll need their IDs later
Categories and channels come back separated, not as one pile
Run it by hand, or call it from another scenario as a building block