For Site to Site VPN in System logs showing ( description contains 'IKE phase-1 SA is deleted SA: 10.10.10.1-10.10.10.2 cookie:eb16a2088724d32c:0000000000000000.' )
Thank you in advance,.
The responder cookie is all zeros which means phase 1 failed early.
At this point I would advice to look at the other firewall's logs to see what option in phase 1 wasn't allowed. It could be as simple as an IP address mismatch where the peers were defined.
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