You can use your Microsoft account to check the warranty of your Surface. Here's how:
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Sign in to your Microsoft account.
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If your device is registered, you will see your warranty information to the right of your device's image.
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Select Info & Support to see additional details about your device's warranty.
Please note that your device must be registered under your Microsoft account to view warranty information. You can register your device by going to Device Services and selecting Register Device at the top of the page.