Did you get such error message while submitting your sitemap to Bing Webmaster Tools?

We encountered an issue when we tried to download this sitemap

You probable is using Yoast SEO plugin.

There are two things to do to solve this issue:

1. Disable  sitemap option in Yoast properties

Disable Yoast Sitemap

2. Install Google XML Sitemaps plugin
https://wordpress.org/plugins/google-sitemap-generator/

That’s it. All errors should be gone then Bing will read your sitemap next time.