Ckeck Users Exists in Team D365

function Teammemberexists()
{
var returnresult = false;
var req = new XMLHttpRequest();
req.open("GET", Xrm.Page.context.getClientUrl() + "/api/data/v9.1/teammemberships?$select=systemuserid,teamid&$filter=systemuserid eq "+systemuserid+" and  teamid eq "+Teamid, true);
req.setRequestHeader("OData-MaxVersion", "4.0");
req.setRequestHeader("OData-Version", "4.0");
req.setRequestHeader("Accept", "application/json");
req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
req.setRequestHeader("Prefer", "odata.include-annotations=\"*\"");
req.onreadystatechange = function() {
    if (this.readyState === 4) {
        req.onreadystatechange = null;
        if (this.status === 200) {
            var results = JSON.parse(this.response);
            if(results.value.length > 0)
            returnresult = true;
           
        } else {
            Xrm.Utility.alertDialog(this.statusText);
            return returnresult;
        }
    }
};
req.send();
return returnresult;
}