MCAS logcollector docker image : 0 logs received

I followed that documentation : https://learn.microsoft.com/en-us/defender-cloud-apps/discovery-docker-ubuntu?tabs=ubuntu

My Collector is displaying a connected status in the console : 

But as you can see, no data was received, and if I do a collector_status -P on my docker : 

I checked all possible logs files, nothing helped me

So if someone can help about that.. 

Thank you !