Since the completion of the 4/2 maintenance of the Xbox NA server I have been unable to play. I've rebooted my Xbox twice and after trying to start the game it drops back to the Xbox home page and then after a few moments pops up the message "You need this update, but we can't get it right now. Try again in a while. 0x8b050033"
Nothing in Xbox Live status nor ESO server status pages indicates a problem.