From logs I found 10.90.0.200 did not match as Peer Identification, so I put that IP in IKE Gateway property as Peer Identification and my Public IP as Local Identification and problem got resolved. Customer is saying I should not see this IP because their firewall is behind NAT and this is internal IP of their VPN gateway. I am still not sure why but tunnel came up. I don't have this issue anymore.
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