I added your conf and restarted HA. Then go to Supervisor → Mosquito → Log
[s6-init] making user provided files available at /var/run/s6/etc...exited 0.
[s6-init] ensuring user provided files have correct perms...exited 0.
[fix-attrs.d] applying ownership & permissions fixes...
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts...
[cont-init.d] mosquitto.sh: executing...
[21:29:02] INFO: Setting up user mqtthass
[21:29:02] INFO: SSL is not enabled
[cont-init.d] mosquitto.sh: exited 0.
[cont-init.d] nginx.sh: executing...
[cont-init.d] nginx.sh: exited 0.
[cont-init.d] done.
[services.d] starting services
[services.d] done.
[21:29:02] INFO: Starting NGINX for authentication handling...
[21:29:03] INFO: Starting mosquitto MQTT broker...
1633717743: mosquitto version 1.6.12 starting
1633717743: |-- *** auth-plug: startup
1633717743: Config loaded from /etc/mosquitto/mosquitto.conf.
1633717743: Loading plugin: /usr/share/mosquitto/auth-plug.so
1633717743: ├── Username/password checking enabled.
1633717743: ├── TLS-PSK checking enabled.
1633717743: └── Extended authentication not enabled.
1633717743: Opening ipv4 listen socket on port 1883.
1633717743: Opening ipv6 listen socket on port 1883.
1633717743: Opening websockets listen socket on port 1884.
1633717743: Warning: Mosquitto should not be run as root/administrator.
1633717743: mosquitto version 1.6.12 running
1633717743: New connection from 127.0.0.1 on port 1883.
1633717743: Socket error on client <unknown>, disconnecting.
1633717743: New connection from 172.30.32.1 on port 1883.
1633717743: New connection from 172.30.32.1 on port 1883.
1633717743: New client connected from 172.30.32.1 as auto-A1F17FB2-0B2A-3E3A-B2F2-AC22D44CA97B (p2, c1, k60, u'mqtthass').
[21:29:04] INFO: Successfully send discovery information to Home Assistant.
[21:29:04] INFO: Successfully send service information to the Supervisor.
and this is zigbee2mqtt status
Oct 08 21:30:05 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:30:05: MQTT publish: topic 'homeassistant/sensor/0x00158d000588a12a/pressure/config', payload '{"availability":[{"topic":"homeassistant/bridge/state"}],"device":{"identifiers":["zigbee2mqtt_0x00158d00
Oct 08 21:30:05 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:30:05: MQTT publish: topic 'homeassistant/sensor/0x00158d000588a12a/voltage/config', payload '{"availability":[{"topic":"homeassistant/bridge/state"}],"device":{"identifiers":["zigbee2mqtt_0x00158d000
Oct 08 21:30:05 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:30:05: MQTT publish: topic 'homeassistant/sensor/0x00158d000588a12a/linkquality/config', payload '{"availability":[{"topic":"homeassistant/bridge/state"}],"device":{"identifiers":["zigbee2mqtt_0x00158
Oct 08 21:30:05 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:30:05: MQTT publish: topic 'homeassistant/sensor/0x00158d0006795415/battery/config', payload '{"availability":[{"topic":"homeassistant/bridge/state"}],"device":{"identifiers":["zigbee2mqtt_0x00158d000
Oct 08 21:30:05 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:30:05: MQTT publish: topic 'homeassistant/sensor/0x00158d0006795415/temperature/config', payload '{"availability":[{"topic":"homeassistant/bridge/state"}],"device":{"identifiers":["zigbee2mqtt_0x00158
Oct 08 21:30:05 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:30:05: MQTT publish: topic 'homeassistant/sensor/0x00158d0006795415/humidity/config', payload '{"availability":[{"topic":"homeassistant/bridge/state"}],"device":{"identifiers":["zigbee2mqtt_0x00158d00
Oct 08 21:30:05 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:30:05: MQTT publish: topic 'homeassistant/sensor/0x00158d0006795415/pressure/config', payload '{"availability":[{"topic":"homeassistant/bridge/state"}],"device":{"identifiers":["zigbee2mqtt_0x00158d00
Oct 08 21:30:05 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:30:05: MQTT publish: topic 'homeassistant/sensor/0x00158d0006795415/voltage/config', payload '{"availability":[{"topic":"homeassistant/bridge/state"}],"device":{"identifiers":["zigbee2mqtt_0x00158d000
Oct 08 21:30:05 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:30:05: MQTT publish: topic 'homeassistant/sensor/0x00158d0006795415/linkquality/config', payload '{"availability":[{"topic":"homeassistant/bridge/state"}],"device":{"identifiers":["zigbee2mqtt_0x00158
Oct 08 21:31:35 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:31:35: MQTT publish: topic 'homeassistant/temp-dormitor-noi', payload '{"battery":100,"humidity":47.98,"linkquality":120,"pressure":1015.3,"temperature":24.45,"voltage":3005}'
Now I am surprised because I have no idea who is "172.30.32.1 " but looking on terminal on HA i see HA has this ip on eth0. why? And seems somehow mosquito will start on this ip i guess
In supervisor → system my ip is 192.168.55.10/24 which is the one I am accessing the interface also and is defined on zigbee2mqtt as mqtt server.
Zigbee2mqtt client have the ip 192.168.55.11 but i don t see it anywhere in log…
What is wrong with my configuration ?
thanks a lot for log suggestion 
L.E. - I rebooted HA (host ) and after came back I have this in log of HA
[s6-init] making user provided files available at /var/run/s6/etc...exited 0.
[s6-init] ensuring user provided files have correct perms...exited 0.
[fix-attrs.d] applying ownership & permissions fixes...
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts...
[cont-init.d] mosquitto.sh: executing...
[21:46:11] INFO: Setting up user mqtthass
[21:46:11] INFO: SSL is not enabled
[cont-init.d] mosquitto.sh: exited 0.
[cont-init.d] nginx.sh: executing...
[cont-init.d] nginx.sh: exited 0.
[cont-init.d] done.
[services.d] starting services
[21:46:12] INFO: Starting NGINX for authentication handling...
[services.d] done.
[21:46:12] INFO: Starting mosquitto MQTT broker...
1633718772: mosquitto version 1.6.12 starting
1633718772: |-- *** auth-plug: startup
[21:46:13] INFO: Successfully send discovery information to Home Assistant.
[21:46:13] INFO: Successfully send service information to the Supervisor.
1633718772: Config loaded from /etc/mosquitto/mosquitto.conf.
1633718772: Loading plugin: /usr/share/mosquitto/auth-plug.so
1633718772: ├── Username/password checking enabled.
1633718772: ├── TLS-PSK checking enabled.
1633718772: └── Extended authentication not enabled.
1633718772: Opening ipv4 listen socket on port 1883.
1633718772: Opening ipv6 listen socket on port 1883.
1633718772: Opening websockets listen socket on port 1884.
1633718772: Warning: Mosquitto should not be run as root/administrator.
1633718772: mosquitto version 1.6.12 running
1633718772: New connection from 127.0.0.1 on port 1883.
1633718772: Socket error on client <unknown>, disconnecting.
1633718773: New connection from 192.168.55.11 on port 1883.
1633718773: New client connected from 192.168.55.11 as mqttjs_b1d52a3c (p2, c1, k60).
1633718789: New connection from 172.30.32.1 on port 1883.
1633718789: New client connected from 172.30.32.1 as 5sBTAyWxFbyaSzz6TYXHJI (p2, c1, k60, u'mqtthass').
and if I am looking on the zigbee2mgtt log I see this
Oct 08 21:45:55 clhomezgb01 npm[11056]: Zigbee2MQTT:error 2021-10-08 21:45:55: Not connected to MQTT server!
Oct 08 21:46:05 clhomezgb01 npm[11056]: Zigbee2MQTT:error 2021-10-08 21:46:05: Not connected to MQTT server!
Oct 08 21:46:13 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:46:13: Connected to MQTT server
Oct 08 21:46:13 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:46:13: MQTT publish: topic 'homeassistant/bridge/state', payload 'online'
Oct 08 21:46:49 clhomezgb01 npm[11056]: Zigbee2MQTT:info 2021-10-08 21:46:49: MQTT publish: topic 'homeassistant/temp-dressing-etaj', payload '{"battery":100,"humidity":48.92,"linkquality":42,"pressure":1017.6,"temperature":21.47,"voltage":3035}'
So, somehow the zigbee2mqtt is connecting to my HA …but I still have devices unavailable …