issue with gateway after enabling HA

Hi,

I'm french so I apologize if my english is'nt good. 

I tried to activate HA between 2 virtual sophos XG and it works corretly, I see booth sophos after HA enabled. The problem is when HA is activated, the primary device can't ping anymore my 2 WAN gateway with IP 172.30.91.1 (router1) and 172.30.92.1 (router2).

The secondary FW can see both of them without problem but the primary can't ! I did'nt modify anything on my network. All other network works correctly. 
When the primary FW is ON, it is impossible to ping 172.30.91.1 or 92.1 but all is working correctly when it is the secondary ON and the primary OFF. 

Is anyone have a solution for this issue ? I can't activate HA due to this problem...

Best regards,

Guillaume.