markets.books.microsoft

No, since it's the Microsoft Windows Store or Microsoft Edge attempting to communicate with the unsafe, unsupported Microsoft site, Microsoft should fix Microsoft's annoying, huge problem.  See the key there?  Microsoft.  Bitdefender is not in charge of Microsoft's apps or expired certs lol.

Just because edge is attempting to access the url doesn't mean that edge is initiating the command. It may be that a third party app is attempting to access the app and because edge is your default browser, then that's what it uses. It's bitdefenders job to recognise a dead link and suppress warnings from it. MS can't be expected to keep a cert updated to a dead site

No, since it's the Microsoft Windows Store or Microsoft Edge attempting to communicate with the unsafe, unsupported Microsoft site, Microsoft should fix Microsoft's annoying, huge problem.  See the key there?  Microsoft.  Bitdefender is not in charge of Microsoft's apps or expired certs lol.

I have the same question, as I am having the same annoying issue.  Every day, sometimes a couple times a day, this URL is blocked on my PC by Netgear ARMOR (Bitdefender on my router).  If it is an expired certificate, Microsoft please fix your stuff!

I feel like none of these replies address what I feel is the central issue : Why is a connection to a store that I want no part of even happening by default??  They want us to use Edge, and do sneaky stuff to bloat the program up with marketing nonsense.  Then don't bother to make sure the connections are secure.  I felt sorry for them, so I gave it a shot.  Charlie Brown at Lucy's football once again.

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.