You can't have three ASAs in an HA cluster (although you can configure VPN load balancing across more than two ASAs, but they can't be used for firewalling). Your 3rd ASA in the second Data Center will be a separate setup. Failover between data centers will need to be achieved using different methods, such as dynamic BGP failover or DNS-level load balancing.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...