pingsvr: state=up(since 1970/01/01 00:00:00), server=, ha_prio=0 - HA issue

Hi

We have a pair of Fortigate 100D firewalls in A-P mode

We had an issue where the secondary was not joing, and upon checking found multiple disk erros so ran disk repair.  that issue is now fixed.

However, when I run the command "get system ha status" we see the primary is the only member in the cluster and the pingsvr state of the secondary is:

pingsvr: state=up(since 1970/01/01 00:00:00), server=, ha_prio=0

Has anyone ever come across this?

 I have rebooted the secondary to no effect.

the Firmware is 6.06 rev 0272 Fortigate 100D