System.Failover.get_failover_state() returns STATE_FAILOVER_UNKNOWN

Hello,

I've got some problems with interpretation of pycontrol output.

 

I'm fetching System.Failover.get_failover_state(), and in one of our new f5, there is returned state FAILOVER_STATE_UNKNOWN. On web gui, State is set to Active.

 

How can I find an misconfiguration issue, in that case ?