Hi,
There’s a lot going on with the MQTT broker internal credentials, however it is in the documentation :
Quote:
For the internal Home Assistant ecosystem, we register homeassistant and addons, so these may not be used as user names.
For a short answer, define your own MQTT users (as the “system” accounts won’t work). Here’s a wakthrough with a direct link to the HASS MQTT settings to define a local user:
If you want the gory detail, I link to the source code where the Add-On generated “system” accounts are created, and how to extract their credentials here:
this post!