There are several reasons why your AdSense application may have been disapproved, and the most common disapproval reason is because your application is a duplicate of an existing account. More info here: https://yt.be/help/Y315
You should have received an email and a message with more info in Creator Studio. Take a look at the detailed resources and note that you can always reapply for the YouTube Partner Program again in 30 days.
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