Hi,
- What version is running on Failover pair?
- Are you able to ping the failover IP once the both becomes active? Are failover link directly connected or through switch?
- ASAs in Single mode or multiple mode?
- As mentioned reconfiguring the configuration works; have you tried with 'no failover' and then 'failover' to see if they are able to identify each other?
- Please share the output of 'show run failover'
Regards,
Akshay Rastogi