I mean with the same device
I got a windows phone in which im testing
I tried 3 times login with the same account, and yes i can no longer get in with that account
But with the same windows phone i tried selft registering(which mean another account differnet from the one i was using) and im able to log in
I bealive you mean that if i was using differnt devices... for example a ipad and then and iphone, but this is not the case in this scanerio.. im just using one device.
Cheers
Carlos