outlook/Hotmail especially older Hotmail accounts have had a huge well know problem since last summer with dozens if not 100's of spam/scam emails flooding one's junk/spam mail folder each day.
Best advice is to mark it all as Phishing and send them back to Outlook and or move them to your deleted/trash folder - There WAS a block feature that reappeared in the menu that allowed the domains to be blocked but that has recently disappeared again so WTF outlook is doing is beyond us all
my issues was 200 spam a day but now thankfully down to maybe 10 or so - but started up again since Covid-19 and bitcoin scams
at least they are going into the spam/junk as they should and not into the inbox but why Outlook/MS is allowing all this crap is beyond me.
This new problem IS specific to outlook/Hotmail email accounts - with older Hotmail being worse.........
there is a support thread on MS outlook mail pages but we all just say the same -