Mosquitto broker communicates with devices, but devices don’t appear in MQTT Integration in HA

Configuration
1

I installed the Mosquitto addon on a friend’s HA installation and have tried connecting Tasmota to the broker. It connects successfully as demonstrated in the Mosquitto log. However, the devices do not show in the MQTT integration and thus do not appear in entities. I have already turned on SetOption19 in the devices. His configuration is identical to mine, and the devices connect to my MQTT Broker and show up in my HA installation. What can I check/change/fix to get him going?

2

There seem to be many issues with MQTT and Tasmota now, which makes me believe it has something to do with a change in HA.

People are responding to other, more recent issues with MQTT. I am willing to try anything/help debug, but I would like some guidance regarding where to begin.

3

Have you got discovery set up on his (in the mqtt integration)?

Have you tried manually adding the devices as mqtt switches/sensors?

4

I have got discovery setup. How do I add the devices manually?

5

For switches

(obvs mqtt sensor for sensors)