I'm kind of surprised that the Bing guys don't seem to have a system status page (that I could find) and haven't managed to have any kind of status message put on their main page.
EDIT: This appears to be their official Twitter account, which is also silent on the matter as of this writing. If they're unable to update their website, they might put something there as a way to get information out.
EDIT2: This is apparently their blog. Nothing there either as of this writing, but again, might try checking there, as it's another route they might use to get information out if they cannot do so via their main page.
On July 29, 2009, Microsoft and Yahoo! announced a deal in which Bing would henceforth power Yahoo! Search, putting an end to Yahoo!'s in-house crawler.[2] For four years between 2015 until the end of 2018, it was powered by Google,[3] before returning to Microsoft Bing again.