I've been watching the Euros on the PC for nigh on 2 weeks now without issue whilst the TV is in use. Tonight I go to watch the Italy v ROI game and it says my device is not registered. So I go in to change it (this has happened before, too many times!) I deselect the PC device then reselect it and it STILL says I'm not registered and as I've used up my 1 and only monthly change (really, really stupid rule by-the-way) I'm stuffed.
Same here, watched the football all month without issues and tonight my pc is saying not registered. Looking at this area it looks like a system wide issue, hoping it is just for today (I know, wishful thinking !).