MQTT Broker Issues, Can't Connect to Host 172.30.32.1.8123?

I’ve recently flashed some devices with Tasmota with the intention of adding them via MQTT to HA. However, installing the MQTT addon, configuring it, and adding the integration for MQTT - no devices show up! I get this in the system log:

20-03-17 04:04:14 INFO (MainThread) [supervisor.auth] Auth request from core_mosquitto for mqtt
20-03-17 04:04:14 ERROR (MainThread) [supervisor.homeassistant] Error on call http://172.30.32.1:8123/api/: Cannot connect to host 172.30.32.1:8123 ssl:None [Connection refused]
20-03-17 04:04:14 INFO (MainThread) [supervisor.auth] Home Assistant not running, check cache
20-03-17 04:04:14 WARNING (MainThread) [supervisor.auth] No cache hit for mqtt

The MQTT log is showing the devices trying to connect!

1584418768: Socket error on client <unknown>, disconnecting.
1584418778: New connection from 192.168.**.** on port 1883.
[ERROR] Auth error with mqtt
1584418778: Socket error on client <unknown>, disconnecting.
1584418779: New connection from 192.168.**.** on port 1883.

Any suggestions as to why the broker seems inaccessible? - Thanks!!