Just like Google did back in July, Bing announced they have dropped their public submission tool. A way to submit any URL to the Bing index anonymously has been removed. It doesn’t come with any surprise, I suspect.
As I covered at Search Engine Land, Bing said “the URLs received are by far too low quality to be trustable, and webmasters preferring having more ownership of the URLs for their site.” So no harm, at least in Bing’s eyes, by removing it.
Instead, if you really want to get your URLs indexed by Bing ASAP, login to Bing Webmaster Tools and use the feature within the tool itself. You must have the site verified to show you have rights to it. Then go to the Submit URL tool within the Configure My Site menu options.
Forum discussion at Twitter.