MQTT integration not showing devices

Configuration
3

Of course I did :slight_smile: I even tried to use new devices. Did not work
But I found a hint which maybe points in the right direction:

MQTT Not Autodiscovering Devices After core-2021.9.x Update - Configuration - Home Assistant Community (home-assistant.io)

I really have no clue why all devices were visible on the IOBroker MQTT Server and why 5 devices were visible after the switch, but if they killed the autodiscovery process and switched it to the Tasmota Plugin then it is ok for me.