I have been getting this same email recently and being spammed with 90 odd junk emails in my inbox each day. Did you find a solution to your problem?
Microsoft doesn’t consider it a problem. They believe that if hundreds of junk emails go to your junk mail box and not to your inbox, their “system” is working.
Microsoft flatly refuses to change it despite over a decade of complaints.
Initially (several years ago), Microsoft did respond to emails with promises to address the issue, and plenty of promises and reiterating their their commitment to stopping spam. All false promises and the emails from Microsoft just stopped.
I have even been trying to find out why it is that they believe this absolutely ridiculous system is what the users want, Microsoft will not respond and have no intention in resolving it.
Despite being with Hotmail for over 20 years now, I have opened a gmail account and in the (tedious) process of changing all my accounts to my new gmail address.
Microsoft does not care in the slightest.