Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
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You can only use Office in the region it was purchased. See HERE You need to contact Microsoft.
"If you get this message, this means that your product key was purchased in a different country or region than where you're currently located. Office product keys must be redeemed in the country or region where they are purchased. For help with this error, contact Microsoft support."