Not able to see stun logs

Hi all,
Following is my rtp.conf config for Asterisk installed on AWS which also has a NAT in front of it and using a gateway too.

;stunaddr=xx.xx.xx.xx:3478 ;

I have set stun debugging on using :

stun set debug on

I’m unable to see any logs with respect to stun. I simulated the same thing without a gateway on another asterisk installed on AWS with NAT in front of it. I’m able to see the stun logs.
I tried with both Google’s stun server and my private stun server. Same results.

Asterisk Version : 15.4.0
OS: CentOS with NAT and gateway and Ubuntu with NAT.

Please let me know if I’m doing anything wrong or you require to see more configurations to debug the issue.