Why would the warranty on my new xbox one x be expired?

If you have proof of purchase, get in touch with Microsoft and send them a picture of your proof .

Or go online and try register your xbox using the date you bought it . Good luck 👍

I assume you mean December 2019?

This can and does happen, depending on the retailer and how long the product has been on their shelf/inventory.

You will need to contact
https://beta.support.xbox.com/contact-us . As long as you have the required receipt, they should be able to adjust the warranty accordingly.

This exact thing happened to my neighbor about 2 weeks ago. Contacted the local support and they where unable to assist. Eventually the retailer he bought it from where willing to assist with fixing it, until they found out the console is a dud. They will
be exchanging it for a new one for him.

With the semi lockdown we currently have it will be a few days longer before he will be able to get it.

I have tried to contact support but they say there is no way to contact support for this issue as my warranty has expired. This is a brand new device that i registered. same product. this is clearly an error with microsoft.

have you actually registered your Xbox?

sign in at https://account.microsoft.com/devices/ then select your Xbox.

if it then shows a blue button labelled Register Device you should click that and follow the onscreen instructions.

it should then show the correct warranty status