My wife recently bought a Dyson canister style vacuum. It's a horribly gratuitous design and not readily identifiable as a vacuum cleaner at all. Looks more like a cheap preschooler's toy spaceship. I'm not brave enough to ask what she paid for it.
So after studying it for several minutes just to figure out how to turn it on, I used it to vacuum the carpet in my home office. It didn't work. Not at all. It wouldn't pick up anything
It sounds like a jet engine and ear protection would probably be a good idea. I figured it must need emptying or there's some weird button that needs to be pushed for carpet use. Nope. The machine is working as intended, it just won't clean carpet. I finally gave up and used my $39 Home Depot/Rigid shop vac - worked perfectly.