No it is called MQTTuser .
I have set up already a few rpi’s with home assitant.
This time i want to go to a newer rpi but with mqtt is goes wrong.
Also the ip adres is fixed to 192.168.1.43 via this way: https://community.home-assistant.io/t/guide-connecting-pi-with-home-assistant-os-to-wifi-or-other-networking-changes/98768
But not wifi of course, i believe this was successful for i can connect to home assistant via this ip adress.
I am thinking there might be something left in a file somewhere that might have to be deleted.
I already deleted the add on, integration and user, rebooted an started all over but no effect.
I also have declared it in my config but and deleted the others but with no effect.