ive got a question if you decline any of the updates do you get signed out of live? never been in xbox preview before
Anytime an update is refused, whether it's System or Game, you'll always be signed out of live and can't sign back in until you finally accept it.
I just got the same but if you go to your Connect Dashboard you should still be able to access it from there
Email the Xbox Live update Admins. They will sort you out. Were you even in the beta program to begin with? If not, stop now since they have logs of who was accepted in the first place.