Hi,
I am facing a similar issue with my website. Everything was working fine till May, and then I changed the theme. Within a few days, my entire website was deindexed from Bing, Yahoo, and other search partners. I don't know why that happened.
I have reverted the theme to the same one I was using before May, and still, nothing works!
Here is the URL to my website https://trickkas.com
Can somebody please check what's wrong with it? I have tried contacting Bing support, but they don't tell me the issue.
Thank you so much for your time! 
