Just a heads up if anyone was wondering why there submitted sitemap to Bing works, then reports an unexpected issue later. I wrote them asking about this. Official reply.
Hi Dan, Thank you for contacting Bing Webmaster support. We are currently experiencing some issues with our Sitemap fetcher that is affecting multiple sites. We are currently investigating the issue. In the meantime, I have resubmitted your sitemap and will provide an update as soon as possible.
Hi Dan, Thank you for contacting Bing Webmaster support. We are currently experiencing some issues with our Sitemap fetcher that is affecting multiple sites. We are currently investigating the issue. In the meantime, I have resubmitted your sitemap and will provide an update as soon as possible.