Final answer:
The claim that each Azure subscription can only be managed by a Microsoft account is false. Azure subscriptions can be managed both by Microsoft accounts and Azure AD accounts, with Azure AD offering additional business-oriented features.
Step-by-step explanation:
The statement that each Azure subscription can be managed using a Microsoft account only is False. Azure subscriptions can actually be managed by using either a Microsoft account, which is intended for personal use, or an Azure Active Directory (Azure AD) account, which is intended for use within an organization. A Microsoft account provides access to all personal Microsoft services, while an Azure AD account is used for business services and offers additional features such as company branding, advanced identity governance, and directory synchronization.