" I assume that both gateways are identical (appliances, corexl config, software versions etc) and you have configured gateways correctly as a cluster member at first time wizard, and also you have a regular gateway license. Run cpconfig command choose 'enable cluster membership for this gateway', exit from cpconfig menu and reboot the machine. Install policy gateways and then check the status again "
The solution above work for me. I just had to install the policy, and after that my cluster went Up. Thanks