@Alejandro Corral ,
I agree with DSPatrick, we could not change a Microsoft business account to a personal Microsoft Account.
Generally, a Microsoft business account is a Work or School account which is created by an organization’s administrator to enable a member of the organization to access Microsoft cloud services, such as Microsoft Azure, Windows Intune, or activate Microsoft 365 clients which are included in some Microsoft 365 Business Plans.
Besides, a company or school account can take the form of a user’s work email address.
Your Microsoft account is the one that you use for personal services like Xbox Live, Outlook.com, Windows 10, Windows Phone, and more.
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