I've pre ordered fifa 22 but all off my sons m8s r playing a demo through beta but my son...

They are likely playing via the closed Beta which is available form the 11th August to 1st September if you had opted into receiving EA emails and were one of those selected for it:

https://help.ea.com/en/help/fifa/fifa-22/access-fifa-22-closed-beta/

Hey there!

I don't think it's possible to play Fifa 22 Demo yet, I have also got the Pre-order and also doing my own research, there have been some demos been out of previous Fifa.

So what I have gathered FIFA 22 has an October 1 release date on PS5, PS4, Xbox Series X, Xbox One and PC.

They might do demos few weeks before October so my guess would be around Septemeber .

It shouldn't be possible to be able to play demo unless you're in just the training grounds which again, do not think it's possible because my game closes, but when I was away from my Xbox, my friend messaged me saying if I was playing the Demo, I said no, the game closed itself with an error to say the game is not released or ready to play yet.

Hope this helps!
Sparrow

Hello, My name is Jesse. I'm an Independent Advisor and a member of the Microsoft community and I'd love to assist you today.

Please check this out https://help.ea.com/en/help/fifa/fifa-22/access...

Hope this helps

Hello Microsoft Support

I want to cancel my pre order for fifa 18,my son got hold of my account and pre ordered it.

-Juan

You're not missing much.

Put in Medal of Honor. Play it. Congrats, you just played Battlefield 3. I've been staring at my Pre-Order for Battlefield 3 all morning, since playing the 'Beta', which is just a Demo, Devs confirmed this on Twitter and even the forums. Just contemplating
canceling my Pre-Order. I was excited...Really excited for BF3. Then I played that Demo they're trying to pass off for a Beta, despite what we really got was an outdated Alpha, again, confirmed by the Devs.