Can I buy a Xbox from DELL abd then buy extended warranty from microsoft?

Us is a ms store region

You do need to goto the ms store site they only have 2 stores (used to be hundreds) and none in North America (I miss going to .ms store Missisauga myself )

How do I find a Microsoft store in my region? I am in CALIFORNIA, USA

Also thanks for the answer ot is appreciated.

Yep you just need to buy it from ms store in your region along with proof of purchase (has to be within 30-90 days I forget the limit)

I was able to pre-order the Xbox Series X in person at GameStop. I paid in full already but I didn't opt to buy the warranty. Was wondering if Microsoft has a stock warranty and if I can buy an extended warranty from Microsoft as well.

I contacted Microsoft about this as well, they told me that i could purchase their extended warranty within 45 days of purchase. I did order my console from their store, but I am pretty sure that once you register the console with your Xbox account, and
then sign into the Xbox site, there should be an option to extend the warranty.

The Microsoft warranty is actually really affordable, and worth it in my opinion, and i never buy warranties.