Additional Network Ports for Multiplayer Gaming: MAC address not working

Check this link for a possible solution:
https://support.xbox.com/en-NZ/xbox-one/networking/connectivity-wizards/000-Mumbai-wizard-QA-1

hi,

when dmz and port forwarding doesn't work, try to clear your mac adress:

To clear the Network Card Cache (alternate MAC address)

Settings

Network

Network Settings

Advanced settings

Alternate MAC Address

Clear and restart

and checkout there page:

https://support.xbox.com/xbox-one/networking/multiplayer-connection-error-solution

Hey man, try this. Hope this helps!

If you are running into the "Additional authentication needed" error message or are running into error code 0x4000000000000000

while trying to connect to your network, give the following steps a try:

1.From the error message, select Enter alternate MAC address at the bottom of the screen, then select Manual

2.On a wireless PC connect to the Wi-Fi network you are trying to connect your console to. Once you have connected to your wireless network,

you will now need to get the MAC address (physical address) of the PC

3.From your PC, open Command Prompt by typing CMD in the Cortana search box and then type ipconfig/all

4.Your MAC address is listed as "Physical Address" and is shown under the Ethernet adapter Ethernet section. Copy this number down and go back to your Xbox One console.

5.From your Xbox One console, enter the MAC address of your PC into the Alternate Wireless MAC address field. Once you have entered your MAC address,

try connecting to your wireless network again.

What you will need to do is set a static ip address on your xbox. then get in touch with your network administrator and get them to forward the xbox live ports to your xbox ip address.

If they want the xbox mac address you can find that in configure network - go right to additional settings and then select advanced settings.

link for ports

support.xbox.com/.../network-ports-used-xbox-live

Suggest you call the front desk and ask for their IT department. Then, give the MAC address to the IT department and ask them to whitelist that MAC addresse. The MAC addresse is obtained from the Xbox with Settings | System | Network | {name of wireless
network} | Configure Network | Additional Settings | Advanced Settings | Alternate MAC Address | look on the left for the current MAC address.