Dealing with Bing this week, I found out it works, but it's Webmaster tools are just very very delayed.
Two days after submitting sitemap, it has status pending, last crawl date is some strange date from the past, but in reality
bingbot already searched my website.
I have access to my server logs, Bing was there already twice, it did some indexing too.
Apache log record for fetching my sitemap looks like this:
184.108.40.206 - - [05/Dec/2016:01:58:01 +0100] "GET /sitemap.txt HTTP/1.1" 200 63422 "-" "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
I have seen two of thees, Bing searching also
robots.txt and approximately third of my pages, all with status 200, which means OK, then it stopped.
Two days later, nothing in Webmaster tools yet, status pending event for sitemap submission, but my search results started to show in Bing.com search randomly. Once they showed up, me searching site:mywebsitename.com, five minutes later same query showed 0 results.
I tried to disavow link using their Disavow tool, link that mysteriously appears in Bing search results, something like mywebsitename.com/ppc/click/123456 a non existing page, I even made it throwing 404 for several weeks, two days later link still shows in search results.
Bing Webmaster tools are for patient people and everything takes time, it looks like they are not maintained any more.