markets.books.microsoft

Since the expired certificate issue is still ongoing - I reported the site https://markets.books.microsoft.com as unsafe to Microsoft. Maybe if you all do the same, they might take notice!

In Edge go to the site, then go to Help and Feedback, just below Settings in Edge, then "Report an unsafe site", then tick one of boxes to indicate site is phishing or contains malware, and submit.

I also sent a report via the Feedback hub with a screenshot of the expired cert, hopefully that gets noticed also!

Great Idea Darren

I will do this

To be clear, you will have to go to the markets.books.microsoft.com site which means indicating to bitdefender that you understand the risks and still want to navigate to the site. when the site opens up you will find a message "request cannot be served" as the site no longer exists.

from there you will follow darrens instructions 

I actually checked both checkboxes

Unsafe website reported.

To be honest I don't hold out much hope for a resolution to this problem because the webpage doesn't exist. So unless the directive is originated by MS Edge, there's nothing MS can do to fix it.

for instance, if a third party app on your computer is initiating the call to "markets.books.microsoft.com" using edge, then Microsoft has no way of knowing which app is making the call and even if they did know which app was initiating the call, what can they do except contact the owner of the app and tell them that the call is to a redundant site?

This is really down to Bitdefender to somehow record the initiating app and then record it. or just stop producing an alert for every time that URL is called.