Xbox Won't Connect to WiFi
However, MAC filtering can also prevent your console from connecting to Xbox Live . If it is turned on, add your console's MAC address to your router's authorized list, or, turn off MAC filtering temporarily on your router to see if MAC filtering is preventing your console from connecting to Xbox Live .
Where the fuck do I get an Alternate MAC address

Go to Xbox settings and test the current connection, when it says to "enter an alternate MAC address " use the WiFi address listed in the info section of the selected WiFi from your phone on to your Xbox .
Struggling to find your Xbox's MAC address to set it up on a network like Boingo Wireless or a dorm's shared Wi-Fi? This guide will walk you through everything, from understanding what a MAC address is to practical workarounds for getting connected, even before your Xbox is fully configured.

What do I do when my Xbox needs authentication
When your Xbox requires authentication and is unable to connect to Wi-Fi, you can try the following steps to resolve the issue: Clear the alternate MAC address : Press the Xbox button to open the navigation page. Select Profile and System > Settings > General > Network Settings. Select Advanced Settings > Alternate MAC Address > Clear.
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