question

403 means forbidden permission which means you are not authorized or allowed. This happens when you get with wrong credentials like client id or client secret or wrong phone number or extension etc or particular permission is missing.

Make sure if anything changed. Check with devsupport@ringcentral.com team providing them full details of your Api and environment

Compliance Api don't work. I get taskId successfull, Then I using taskId to get report.zip file but taskId return reult is null. Please check, it still work very good in 2019.

I run my test code and it works well today. Can you try this Node JS code on your machine, just make sure you have installed the RingCentral JS SDK and replace the app and user login credentials

var rcsdk = new SDK({
      server: RINGCENTRAL_SERVER,
      appKey: RINGCENTRAL_CLIENTID,
      appSecret: RINGCENTRAL_CLIENTSECRET
  });
var platform = rcsdk.platform();
platform.login({
      username: RINGCENTRAL_USERNAME,
      password: RINGCENTRAL_PASSWORD,
      extension: RINGCENTRAL_EXTENSION
      })
      .then(function(resp) {
          create_glip_compliance_export_task()
      });
 
function create_glip_compliance_export_task(){
    console.log("Create export task.")
    var endpoint = "/restapi/v1.0/glip/data-export"
    var params = {
        timeFrom: "2019-08-01T00:00:00.000Z",
        timeTo: "2020-01-15T23:59:59.999Z",
      }
    platform.post(endpoint, params)
      .then(function(resp){
          var json = resp.json()
          console.log(JSON.stringify(json))
          get_glip_compliance_export_task(json.id)
      })
      .catch(function(e){
          console.log(e)
      })
}
 
function get_glip_compliance_export_task(taskId){
    console.log("Check export task status ...")
    var endpoint = "/restapi/v1.0/glip/data-export/" + taskId
    platform.get(endpoint)
      .then(function(resp){
          var json = resp.json()
          if (json.status == "Completed"){
            console.log(JSON.stringify(json))
              for (var i=0; i<json.datasets.length; i++){
                var fileName = "glip-export-reports/" + json.creationTime + "_" + i + ".zip"
                console.log(json.datasets[i].uri)
                get_glip_report_archived_content(json.datasets[i].uri, fileName)
              }
          }else if (json.status == "Accepted" || json.status == "InProgress") {
              setTimeout(function(){
                get_glip_compliance_export_task(taskId)
              }, 5000);
          }else
              console.log(json.status)
      })
      .catch(function(e){
          console.log(e)
      })
}
 
function get_glip_report_archived_content(contentUri, fileName){
    var uri = platform.createUrl(contentUri, {addToken: true});
    download(uri, fileName, function(){
        console.log("Save report zip file to the local machine. " + fileName)
    })
}
 
const download = function(uri, dest, cb) {
    var file = fs.createWriteStream(dest);
    var request = https.get(uri, function(response) {
        response.pipe(file);
        file.on('finish', function() {
            file.close(cb);
        });
    });
}

Thanks, It work when I run your NodeJS code. But my application with .net SDK still error =))