Error while provisioning a high availability replica: 'sync_peers' index 0 entry 'port' expects an Integer value, got String; in Puppet Enterprise 2016.5.x to 2017.3.x

While setting up high availability (HA), during replica provisioning, I get an 'sync_peers' index 0 entry 'port' expects an Integer value, got String error. Could not retrieve catalog from remote s...