The customer noticed the REST API for Junos configure does not yield a response, for example:

http://10.13.82.108:8181/rests/data/network-topology:network-topology/topology=topology-netconf/node=everest-vp4/yang-ext:mount/junos-conf-root:configuration/junos-conf-policy-options:policy-options/community=CPA-WILDCARD

The root cause is Configuration fetch is not supported with below knob configured, removed this knob then it worked ok

csim@Evrst-vpngnf-re0> show configuration system schema 
openconfig {
    unhide;
}