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First of all, if you want to publish an app in the Microsoft Store, you have to register a developer account. If you haven't registered as a developer, please check this document: Opening a developer account.
If you've already registered as a developer, you could add and manage additional users in your Partner Center account via Azure Active Directory. You could set a role for the users and custom permissions for each user. For more information, please check Manage account users.
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