Re: 500 Internal Server Error encountered when importing PBIX file using PowerShell script

I know how to call the import api to upload a pbix file in C#, however I don't have much expertise on PowerShell. Please reference below C# code and modify the powershell script accordingly

using System;
using System.Net;
using System.IO;  

namespace PBIGettingStarted
{
    class Program
    {
        //Access key for app token
        private static string accessKey = "myaccesskey";

        //Power BI app token values
        private static string workspaceCollectionName = "myworkspace";
        private static string workspaceId = "myworkspaceid";

        private static string pbixFileName = "AdventureWorksdddd.pbix";

        static void Main(string[] args)
        {
            //Imports uri
            var uri = String.Format
                ("https://api.powerbi.com/v1.0/collections/{0}/workspaces/{1}/imports?datasetDisplayName=SampleImport",
                workspaceCollectionName, workspaceId);

            //PBIX file to import
            DirectoryInfo di = new DirectoryInfo(AppDomain.CurrentDomain.BaseDirectory);
            string fileName = @"C:\test\mytest.pbix";
 
            //Create web request
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);

            //Import Request format:
            // Header:
            //  Content - Type: multipart / form - data; ----------BOUNDARY
            //  Authorization: AppToken

            // Body:
            //  ----------BOUNDARY
            //  Content - Disposition: form - data; filename = "{pbix file}.pbix"
            //  Content - Type: application / octet – stream

            //Define POST
            request.Method = "POST";
            request.UseDefaultCredentials = true;

            //Header
            // Boundary
            string boundary = "----------BOUNDARY";
            byte[] boundaryBytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

            // Content - Type
            request.ContentType = "multipart/form-data; boundary=" + boundary;

            // Authorization - Use AppToken jwt for Authorization header
            request.Headers.Add("Authorization", String.Format("AppKey {0}", accessKey));

            //Body
            string bodyTemplate = "Content-Disposition: form-data; filename=\"{0}\"\r\nContent-Type: application / octet - stream\r\n\r\n";
            string body = string.Format(bodyTemplate, fileName);
            byte[] bodyBytes = System.Text.Encoding.UTF8.GetBytes(body);

            //Get request stream 
            using (Stream rs = request.GetRequestStream())
            {
                rs.Write(boundaryBytes, 0, boundaryBytes.Length);
                rs.Write(bodyBytes, 0, bodyBytes.Length);

                using (FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
                {
                    byte[] buffer = new byte[4096];
                    int bytesRead = 0;
                    while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                    {
                        rs.Write(buffer, 0, bytesRead);
                    }
                }

                byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
                rs.Write(trailer, 0, trailer.Length);
            }

            //Get response
            using (HttpWebResponse response = request.GetResponse() as System.Net.HttpWebResponse)
            {
                //If Import succeeds, StatusCode = Accepted 
                var responseStatusCode = response.StatusCode.ToString();
            }
        }
    }
     

    }