Bing Webmaster Tools Compatibility Issues

I recently switched to your plugin from using Yoast for my sitemaps and Google looks great. However Bing will not accept the sitemap as follows:
http://mtnweekly.com/sitemap.xml

Can you please tell me how to get this to work with Bing, as a decent bit of our traffic is starting to know some from them.

Thank you in advance!

https://ww.wp.xz.cn/plugins/google-sitemap-generator/