Helty Official Integration problem

I have problem with Helty Official Integration (Helty Flow - Home Assistant): I have the VMC Helty Flow Pure (wifi controlled)… When I try to add the Helty VMC IP in HA, I receive “Failed Connect” message..
Helty VMC and HA are in the same network and, from HA, I ping the VMC..

Do you have any idea to try to resolve this issue ?