Can't activate Security Heartbeat

Question

Hi, 
 I've just created a Sophos Central Admin user, activated my Subscription (Central Server Protection Advanced / Central InterceptX Endpoint Advanced) and installed on a couple of clients. The problem is that in my Cluster of XG330 (SFOS 17.0.6 MR-6) when i try to activate the Hearthbeat and insert my credentialsi obtain a message saying "Sophos Central registration heartbeat failed, verify your account credentials". 
 Any idea or someone had the same trouble ?

LuCar Toni · Answer

i think you have to go with Sophos Support in this case. 
 Would assume something went wrong on the XG itself. But i cannot troubleshoot this without an session. So the best way is to contact the support or your sophos partner.