OK, so I had some friends over. We normally have to add a guest right from the home screen in order to play NBA 2K14 and then it works just fine. Today, I have tried multiple times to add a guest and it has not worked. I haven't had this issue before, this is the FIRST I've had it on my Xbox One. When I go to the sign in and click on "Add guest" it gives me the message Try Again "There was a problem adding a guest, but it should work if you try again." The problem is that it DOESN'T work no matter how many times I click on Add guest. I contacted Microsoft Support and they told me to remove and then add my account back on the system which DIDN'T work. Anyone else having this problem? I'm very frustrated and my friends ended up leaving and not impressed with the Xbox One!
Sounds like you need to set up a Guest Key on the system
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I have the same problem, and it didn't help to set up a Guest Key :-(
Did anyone ever figure out how to fix this? I'm having the same problem now.
Hold the power button on the console for 5-10 seconds and sign back in this worked for me