when both peers try to build the tunnel there is phase one and phase two during those phases proposal are exchanged , when they find a match the tunnel can be built, in your case as mentionned by the message :(Mismatch: P1 Authentication algorithm in the crypto map entry different from negotiated algorithm for the L2L connection.)
the autehntication algorith is not the same so try with the administartor of the other peers to make the same authentication!!!
remember the only parameters that can be accepted even if it does not much is the LIFETIME.
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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...