Signing in to your Xbox account allows you to enjoy various benefits, including:
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Syncing user and app data across your devices.
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Making in-game and app purchases.
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Accessing premium subscriptions, such as Xbox Live Gold and Xbox Game Pass.
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Saving game progress and achievements in the cloud.
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Customizing your Xbox profile and avatar.
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Sharing content with friends and participating in online multiplayer games.
For more www.microsoft.com/link