Xrm.Webapi.retrieveMultipleRecords throws 404 error while retrieving "EntityDefinitions"

Hi Experts,

I am trying to retrieve "EntityDefinitions" using Xrm.Webapi.retrieveMultipleRecords and it is working fine in classic UI.

But in UCI it is throwing error 404.

Below is the code snippet I am using,

var metadata = "?$select=PrimaryNameAttribute,DisplayName,SchemaName,LogicalName";
Xrm.Webapi.retrieveMultipleRecords("EntityDefinitions", metadata, null).then(function (result) {

var entities = result.entities;

}, (error){

console.log(error);

});