Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Sebastian A,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well?
Sorry for the inconvenience. Kindly raise a ticket with Microsoft via https://azure.microsoft.com/support/create-ticket/
You can contact Microsoft business support via telephone. Click link below and select your region to find contact number:
https://support.microsoft.com/help/c0389ade-5640-e588-8b0e-28de8afeb3f2
Alternative support channel: https://learn.microsoft.com/microsoft-365/admin/get-help-support
See thread to similar inquiry: https://learn.microsoft.com/answers/questions/1016233/i-am-unable-to-change-my-developers-account-addres
Please let me know if you need more assistance.
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Warm Regards