I've had the same thing pop into my mailbox a few days ago.
When I select the email the Report function is blocked somehow.
When I've gone to look into the sign-in history there are about 50 unsuccessful attempts (that were not me!) over the last month.
Is this normal or is my account being targeted for hacking?
I've changed my password to a complicated one so good luck to them trying.
I have over 5,000 hacker attempts in my outlook and they Continue at a Rate of About 100 per day. each day, since Reporting. They are Obviously trying Until the machine gets the password Right. WHY do Microsoft *Refuse to Limit these, you wonder, Even After Repeatedly being told about it….There can BE Only 1 Reason