This is pretty hard to troubleshoot without seeing configuration but I would make sure you have routes on both sides for the remote subnets point to the tunnel (usually the outside interface). I would also make sure you have nat exemptions rules going both ways and you matching acls are the same on both sides.
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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...