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Free developer registration for individual developers
Starting later next month, individual developers will be able to publish apps to the Microsoft Store without paying any onboarding fees – making it the first global digital storefront to eliminate such charges. Developers will no longer need a credit card to get started, removing a key point of friction that has affected many creators around the world. By eliminating these one-time fees, Microsoft is creating a more inclusive and accessible platform that empowers more developers to innovate, share and thrive on the Windows ecosystem. Visit https://aka.ms/microsoftstoredeveloper to get started.
https://blogs.windows.com/windowsdeveloper/2025/05/19/micros…
I believe this is what you need for emulating on Xbox (currently/used to be US$19).