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Microsoft 365 and Office | Install, redeem, activate | For home | Windows
Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
The 'Service Unavailable' error indicates there is a problem with the Office licence.
Office Standard 2024 is a volume licence version of Office used by large organizations, it is not a correct home consumer licence version of Office and you will not be able to activate that licence, even if it does activate, the licence would deactivate automatically later.
This is a widely reported scam on Groupon, they are selling cheap Office Standard 2024 and Office Pro Plus 2024 licenses to the general public, you need to contact the seller on Groupon to get a full refund for your purchase, they should not be selling that type of Office licence to the general public.