Some updates on the issue.
I totally removed netdata and abandoned that way to install Netdata with ansible (by using netdata package published on https://packagecloud.io):
I switched to the way described within the documentation (by using kickstart.sh):
I successfully claimed the node on netdata.cloud.
But now I am facing an issue when trying to move the netdata/cache folder to /home/netdata/cache as described in Can't start Netdata with /home/netdata as cache directory