Changing the DNS settings via the router instead of on the Xbox itself would be a much easier and better idea imo. It would also let all your devices use the same DNS settings rather than having to manually change each one.

8 Best DNS Servers 2020 [Gaming, PS4 & Xbox One] Jul 01, 2020 How to change Xbox One DNS to boost network speed and Feb 18, 2020

Setup Smart DNS for Xbox 360 - Getflix

Mar 03, 2019 Static IP Address for Xbox One - port forward Set up a Static IP address in your Xbox One Console. If you have a router that does not allow you to manually assign internal IP addresses, follow these instructions to set up a static IP address in your Xbox One console: 1. Find out what IP address, subnet mask, gateway, and DNS settings your Xbox One console is currently using. To find this info: Xbox Support

Mar 27, 2019

Completing the only requirement as described above, now head over to your Xbox One. The below steps are presented for you which will help you apply the CyberGhost Smart DNS via Xbox One: Step 1 of 6: From the System settings menu of your Xbox One – choose Settings. Step 2 of 6: Choose Network from the list of choices American Netflix DNS Codes (Feb. 2020)