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In the initial step of the tenant set up, you will need to choose your domain name (1). What is important at this moment you will configure it for the .onmicrosoft.com address, but later on, you will be able to add your custom domain, like office365atwork.com.
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If you continue to have issues after trying these tips, please reach out to Microsoft Support for expert assistance with the Microsoft Store: -us/account-billing/contact-microsoft-store-support-4f615f2a-6bbd-fd69-6695-ae213d63eef0 041b061a72