In order to update your warranty, you will need to provide a valid sales/purchase receipt from an authorized retailer. Provide information on the Warranty Support request form and select Submit.
On the row for Warranty claims, select Learn more. Select Info & support and, if necessary, select Register to register the device and see coverage details. Go to Microsoft account | Devices and locate your device. Here's how to submit a request to support:
Note: It may take up to 24 hours to update after it's been completed.