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If you want to publish your app to the store, you will need to have a developer account fist. Then you need to Create your app by reserving a name and Create an app submission for your app. Next, you will need to Upload your app's packages and complete other information for the Submission. After submitting your submission, the store will have a check on your app. Once your app passed the certification, your app will be published to the store successfully.
For more details, please refer to this document: Publish your app in the Microsoft Store
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