Hellom
Have you already assigned a context to one of the failover groups?
hostname(config)#failover group 1
hostname(config-fover-group)#primary
hostname(config-fover-group)#exit
hostname(config)#failover group 2
hostname(config-fover-group)#secondary
hostname(config-fover-group)#exit
hostname(config)#context context_name
hostname(config-context)#join-failover-group {1 | 2}
hostname(config-context)#exit
You can share the configuration if this step is already done.
Regards.
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Julio
Cisco Security Engineer
Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC