I have 3 Dyson air purifier machines at home, but this app only let me install only one of them. The other 2 machines for some reason it won't let me connected to this app at all. Even though I did all the steps correctly. I even unplugged them and waited 10 minutes to try to link them up again, but it still would not let me do it at all. So frustrated! Arrrrgggggghhhhhhh! Stupid and useless app! 😡