Excessive messaging
Yeah! Found the solution: exit from the game and log in again…
Wunderschön. Btw, in the previous 15 minutes no one was doing the specific champion (I was banned from chat) and after relogin I advertised and booom: 9 players in a glimpse.
Message suppression kicks in much faster if you spam the exact same message over and over again.
Try varying your wording each time you say something.
Hmm, thank you for the tip, I’ll try it next time.