Ok little update.
I initially configured my HE with DHCP – it was given 192.168.1.114 just for the record 
I later decided to change it to fix IP. 192.168.1.200, at the router and by configuring the IP as static in HE.
It was working fine locally, but I was not able to access my hub with « my.hubitat.com ». The cloud was still seeing HE as 192.168.1.114 (at discovery time) and was displaying a message saying no HUB registered.
Thanks to @aaiyar, Discover HE with MAC returns HUB with old IP who suggested that I perform a reset of HE.
Now I have the right IP assign, and Leviton integration is working like a charm.
Cheers.
J.
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