Csharp HttpClient 未经持有者令牌授权

由于HttpWebRequest已经过时的事实，我正在升级到.NET6中的等同版本.

我不明白为什么我会收到一辆未经授权的401.我可以成功获得持有者令牌，但我似乎找不到正确的组合来成功上传文件.

private static async Task UploadCsvFileAsync(string authToken)
{
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri("https://subdomain.domain.com/");
        client.DefaultRequestHeaders
            .Accept
            .Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
        using (var request = new HttpRequestMessage())
        {
            request.RequestUri = new Uri(uploadUrl);
            request.Method = HttpMethod.Post;
            request.Headers.Add("api-version", "1");
            request.Headers.Add("Authorization", $"Bearer {authToken}");

            string header = $"{Environment.NewLine}--{formBoundary}{Environment.NewLine}" +
                $"Content-Disposition: form-data; name=\"csvfile\"; filename=\"{csvFileName}\"{Environment.NewLine}" +
                $"Content-Type: text/csv{Environment.NewLine}{Environment.NewLine}";
            byte[] headerBytes = Encoding.UTF8.GetBytes(header);
            var headerContent = new StreamContent(new MemoryStream(headerBytes));
            headerContent.Headers.ContentType = MediaTypeHeaderValue.Parse("application/octet-stream");
            var content = new MultipartFormDataContent();
            content.Add(headerContent, "metadata", csvFileName);

            var response = await client.PostAsync(uploadUrl, content);
            // the response code is 401 - Unauthorized
        }
    }
}

我让.NET Framework4.x代码正常工作.因为我们要将代码迁移到.NET6，所以必须重写.

显然，我做错了什么--我似乎就是想不出我错过了什么.

如有任何帮助，我们不胜感激.提前谢谢您.

Edit:03/29/2023 - including correct code as provided by answer below..

private static async Task UploadCsvFileAsyncV2(string authToken)
{
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri(uploadUrl);
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", authToken);
        client.DefaultRequestHeaders
            .Accept
            .Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
        using (var request = new HttpRequestMessage(HttpMethod.Post, "uploads"))
        {
            request.Headers.Add("api-version", "1");
            string header = $"{Environment.NewLine}--{formBoundary}{Environment.NewLine}" +
                $"Content-Disposition: form-data; name=\"csvfile\"; filename=\"{csvFileName}\"{Environment.NewLine}" +
                $"Content-Type: text/csv{Environment.NewLine}{Environment.NewLine}";
            byte[] headerBytes = Encoding.UTF8.GetBytes(header);
            var headerContent = new StreamContent(new MemoryStream(headerBytes));
            headerContent.Headers.ContentType = MediaTypeHeaderValue.Parse("application/octet-stream");
            var content = new MultipartFormDataContent
            {
                { headerContent, "metadata", csvFileName }
            };
            request.Content = content;

            var response = await client.SendAsync(request);
        }
    }
}