Thanks for reaching out to us, the best way for this issue will be creating a ticket in Bing through here.
You can find more information in Bing Help Center, here is some clues I found about website is not indexed in Bing:
Why is my site not in the Bing index?
Indexing of site depends on multitude of factors relating to site quality, viewer impressions, copyright claims etc., and hence we urge webmasters to check if they are following our Bing Webmaster guidelines.
Check out the Site Explorer Tool to check for errors in crawling or serving of your site.
Please note that if your website has just been published or has undergone a major revamp recently, it might take up to couple of weeks for us to discover and show in rankings.
You can use our Submit sitemaps tool to let Bing discover your site faster.
Hope this helps, please kindly accept the answer if you feel this is helpful or let us know if you have more questions. Thank you.