How sign in works in Microsoft 365
https://support.microsoft.com/en-us/office/how-sign-in-works-in-microsoft-365-1d646e83-1585-4278-8daf-d4a2cc0905e0
With Microsoft 365, you can install and sign in to Office on 5 PCs or Macs, 5 tablets, and 5 phones. If you sign in to Windows using your work or school account, you'll be signed in to Office automatically. On Macs and mobile devices, sign in using your work or school account to activate Office.
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