Windows Server下Wacom签名捕获DynCaptPadError问题求助

我在MVC Web表单中集成Wacom平板实现签名捕获，采用Wacom Ink SDK for Windows开发。本地IISExpress环境运行正常，但部署至Windows Server 2019服务器的IIS后，出现DynCaptPadError错误，且Wacom官方提供的Sign Pro PDF软件在该服务器上也无法正常运行。已使用高级授权密钥，服务器已安装与本地一致的SDK、设备驱动及.NET Framework。现咨询以下问题：

• SDK的授权验证机制是什么？
• 是否需要从服务器开放端口至外部站点？
• 还存在哪些遗漏配置？

相关实现代码 #

private void btnSign_Click(object sender, EventArgs e)
{
    SigCtl sigCtl = new SigCtl();
    sigCtl.Licence = "XXXXX";
    DynamicCapture dc = new DynamicCaptureClass();
    DynamicCaptureResult res = dc.Capture(sigCtl, "Who", "Why", null, null);
    if (res == DynamicCaptureResult.DynCaptOK)
    {
        SigObj sigObj = (SigObj)sigCtl.Signature;
        sigObj.set_ExtraData("AdditionalData", "C# test: Additional data");
        String filename = "sig1.png";
        try
        {
            sigObj.RenderBitmap(filename, 200, 150, "image/png", 0.5f, 0xff0000, 0xffffff, 10.0f, 10.0f, RBFlags.RenderOutputFilename | RBFlags.RenderColor32BPP | RBFlags.RenderEncodeData);

            using (FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read))
            {
                sigImage.Image = System.Drawing.Image.FromStream(fs);
                fs.Close();
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
       
    }
    else
    {
        print("Signature capture error res=" + (int)res + "  ( " + res + " )");
        switch (res)
        {
            case DynamicCaptureResult.DynCaptCancel: print("signature cancelled"); break;
            case DynamicCaptureResult.DynCaptError: print("no capture service available"); break;
            case DynamicCaptureResult.DynCaptPadError: print("signing device error"); break;
            default: print("Unexpected error code "); break;
        }
    }
}

补充说明：仅在IIS部署时出现DynCaptPadError，IISExpress环境正常，恳请指导。

内容的提问来源于stack exchange，提问作者Mr B