Downlink from Mosquitto to Mqtt TTN does not function?

I want to create a script on my Home Assistant that invokes the service “MQTT Publisc” with appropriate Topic and Payload and I want that to be downloaded on MQTT TTN as reported on Mosquitto MQTT Bridge-Usage and Configuration. And MQTT Server | The Things Stack for LoRaWAN
But I see that while the MQTT TTN flow to MQTT HA works great, the opposite does not. Although in the bridge.conf file I entered “Topic: # both 0” . I’m a novice and I’m definitely missing something. Thank you for your courtesy