While he was working from home, a friend of mine recently got a phone call, from "Microsoft support", claiming to want to help him fix his PC. Fortunately, he's the suspicious type. And he's right to be. It's a scam - and I've now heard that other people are getting the same calls.
Obviously, we have quite enough to do without randomly phoning people unprompted, and asking if we can remotely access their PC. It's just a straightforward scam, in which they attempt to gain access to your PC and all of your secret stuff.
If it's something you wanted to warn your parents or students about, there's some more information, and there's official Microsoft advice about phishing, on the Microsoft Protect site - and specifically on this page "Avoid scams that use the Microsoft name fraudulently"