Have you tried to [url=https://help.bungie.net/hc/en-us/articles/360049196071-Accessing-and-Restoring-Licenses-to-Destiny-Content]restore your licenses[/url]?
If the steps in that article don't resolve the issue, you'll have to work with Microsoft support for further assistance, as they control your license for that content.
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I have tried that but Beyond Light is not available and it says I need to purchase it.
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In that case, only Microsoft support can help you figure out what happened to your license.