Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
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You cannot add Apple devices to your Microsoft account.
You can only add Microsoft devices, such as Windows PCs, Surface laptops, Xbox consoles and controllers, and Microsoft accessories like keyboards or mice.
As the AI suggested, please install the Office apps (Word, Excel, PowerPoint, Outlook, etc...) individually from the Apple App Store and sign in with the account associated with your Microsoft 365 (Office 365) subscription.