内存流在通过 HttpPost 发布时为空

问：

我从 BuildPackage 方法获取内存流，并通过 D365 Enqueue api （UploadBinaryAsync） 发送此流。 不知何故，当我在本地测试时，我可以在 D365 中看到数据，但是当我在 azure 中部署代码时，我看到的是空流。我错过了什么吗？

 public async Task SendPackage(Entities Entities)
    {

尝试 { var stream = await _packageBuilderProvider.BuildPackage（实体）;

            var bearerToken = await _authorizationProvider.GenerateBearerTokenAsync();
            
             stream.Position=0;
            var response = await _httpCustomClientProvider.UploadBinaryAsync(_vendorPaymentsEnqueueUrl, stream, bearerToken);
            var res = response.Content.ReadAsStringAsync();
            response.EnsureSuccessStatusCode();
        }
        catch (Exception ex)
        {
            _logger.LogError($"VendorPaymentsProvider-Something went wrong while sending the vendor payment data package. Please exception details:{ex}");
           // throw;
        }

}

UploadBinaryAsync 的代码

public async Task UploadBinaryAsync（string？ path， Stream stream， string bearerToken） { 尝试 {

            StreamContent content = new(stream);
            content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            content.Headers.ContentLength = stream.Length;
            return await this.PostAsync(path!, content, bearerToken);
        }
        catch (Exception ex)
        {

            
            throw;
        }
    }