I bought an HTC Dot View case (not a generic) from Amazon. It worked without having to do anything. I just put my phone in it, and it worked. Maybe you got a bad one?
There is an update to the dot view. Check and see if will update and fix your issue. If you scroll thru the main page of windows central there was an article about the update with a direct link.
Got the Xbox case as well. I can the notification icons but can't answer/reject calls or see call history regardless of the setting being checked. Not sure if its something I've done wrong or what.