If your employer or school uses Azure Active Directory (AAD) to manage the account it provides you, you can use your work or school account to sign in to Microsoft products, such as Microsoft 365 and Office 365, and third-party products provided to you by your organization. If required by your organization, you will also be asked to provide a phone number or an alternative email address for additional security verification. And, if allowed by your organization, you may also use your work or school account to sign in to Microsoft or third-party products that you acquire for yourself.