Tasmota can't seem to connect to mqtt

I have bene trying to set up home assistant again from scratch, to fix some issues, and just clean up some of the “hacked” together stuff. This has been nothing short of a nightmare so far.
Here is the offending error:

homeassistant.exceptions.HomeAssistantError: Cannot subscribe to topic ‘tasmota/discovery/#’, make sure MQTT is set up correctly

However I would guess it is “Set up correctly” as I can connect to it with MQTT Explorer.
Ideas?

So this is my goof, so I will post the solution for anyone looking. Looks like the Mosquito broker is separate from the MQTT integration. Thinking about that it makes sense, and I had not configured it.

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