How to force Xbox One to use 5GHz instead of 2.4?

Does your router allow you to set a per band specific Wireless MAC Filter (eg ASUS GT-AC5300 includes this type functionality)? If it does, then add your Xbox to the 5G band and leave it out of the 2.4 band (or vice versa...specify which can use 2.4 and
leave Xbox off of that list).

Unfortunately...that would likely mean you'd have to specify all of the other devices allowed to use 2.4 as well (you could leave 5G open if you didn't want to restrict other devices).

Good luck!

Another option is to alter what band your routers 2.4GHz is set to. This may stop the interference

Thanks everyone and fully appreciate all the suggestions "outside" of the Xbox.

Ideally I was looking for a way to configure the Xbox itself, and not have to do anything funky with my network - but seems that's just not possible (like it is by tinkering with a PC network adapter using admin rights.)

For reference, I'm using a Linksys Velop "mesh" wifi system with two nodes. There is no way to force an individual device on this system to use 5GHz, apart from separating the bandwidths - which actually defeats the purpose of the product's design, which
is to be as smoothly transitional as possible when moving from room-to-room with no signal loss.

I may just go the Homeplug route since I have some old adapters hanging around somewhere. Just hope the network speed is better than 2.4 - even if not as fast as 5GHz.

you need to change the name of one of the networks or it will preferentially connect to the 2.4 network

Another option is to alter what band your routers 2.4GHz is set to. This may stop the interference

We've tried every band already - seems our 1250W microwave gives off a veritable "EMP" while cooking food!