if both phases are still showing green ,the tunnel is actually up how did you set the monitoring profile? have you tested pinging the remote IP for reachability before enabling tunnel monitoring? double check if your security policy allows pinging the remote IP, double check if there is a need for additional routes or proxy-IDs for the remote IP, check if the IP is accepting ping (it may require a profile to be activated, or an ACL/security policy to be updated before you are able to ping it
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