Gateway's last seen on lorawan network server remains "never"


we have Dragino L308 Gateway which is configured for US band but status of the gateway remains never on LoraWAN network server.

we have also installed chirpstack gateway brigde on Gateway with the help of document provided here.

We have confirm that Packet forwarder configured correctly as we can see communication between Packet forwarder and chirpstack gateway bridge, but we cannot see publish event/data in the gateway log.

Could you please suggest some solution to confirm communication between Gateway chirpstack bridge and MQTT Broker which is on Lorawan network server?

Any Leads would be apperciated!