Perhaps your 10Gb internal network isn't working between the 4 ESXi hosts.
To verify the internal network is working - use the "network connectivity-check CLI commands from the Deploy VM or make a vmkernal port on each host (on the vSwitch you have the 10Gb network for internal comm) and try vmkping between the hosts over that vmkernal network.
Latest version is 9.1.23 just in case you're using an old one 😉