There is a funny thing about web-search. If a page has never been loaded up and indexed by the search engine, it cannot be found by web-searchers. Seems logical, does it not?
Bing is the slowest web-crawler, and they do not have the powers to (or interest in) keeping but a small fraction of the web in their databases. Which then by definition becomes the only pages that can be found in Bing. (Not merely lower ranked, but simply non-existent in their database.)
For comparison, I have one web-site that has been around for years, where Google track 30,000+ pages in their database, while Bing only track 87 pages. No errors or other mysteries reported by Bing's tools. They are apparently merely not interested. Quite a difference?
So personally, I have found Bing to be of little value, unless your page/content somehow is related to making them revenue.. I eventually stopped even trying to manage Bing accounts.
But I guess it depends on how your content is relevant and usable for them in either attracting searchers to their product affiliate pages, or their ads pages.