Error code 999 occurs when you try to start the Xfinity app on your Xbox 360 console
You may see the following error code and message when you try to start the Xfinity app on your Xbox 360 console:
We were unable to activate XFINITY® TV on Xbox 360.
Status code: 999
You may also see a message that resembles the following:
The setup process has timed out. Please try again in a few minutes. If you continue to have issues, please visit http://www.xfinity.com/xbox for more information.
This may mean that that the Xfinity app cannot be activated on your Xbox 360 console. For example, this issue can occur if the Xfinity service cannot authenticate your account or if your Xbox 360 can’t connect to the Xfinity servers.
For information about how to resolve this issue, go to Xfinity.com/xbox or call the Xfinity Support Line at (877) 599-1846.
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