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It seems that you are developing a packaged C++ WinUI 3 apps. If it is, when you package your app, it will automatically add the runFullTrust capability. You will need to provide more info in order to receive approval in the Submission Options. For each capability, tell why your app needs to declare the capability and how it is used. Be sure to provide as much detail as possible to help the store team understand why your product needs to declare the capability.
For more information, please refer to this document: Manage submission options
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