I've two factor authentication on my Apple account and now every time I use a new browser (or after clearing the Cache) and try to log into one of the Apple developer sites it sends me the authentication code to the same machine that I'm using. How is that two factor ?
I've an iPhone which is connected to the same account but it's not my primary phone so it's most likely not ON when I do this. I guess Apple tries to send the code to my phone and when it fails sends to the next online device which happens to be the same machine I'm using to log in. So all I have to do is click Allow and enter the 6 digit code which is displayed in a different app.