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Hi Eric,
To get Office fully functional again, we need to connect to the Internet and let the Activation and Validation Service reactivate the installation.
As part of the installation process, Office 365 ProPlus communicates with the Office Licensing Service and the Activation and Validation Service to obtain and activate a product key.
Each time we log on to our computer, the computer connects to the Activation and Validation Service to verify the license status and extend the product key (This process requires Internet connection). As long as the computer can connect to the Internet at least once every 30 days, Office remains fully functional. If the computer goes offline for more than 30 days, Office enters reduced functionality mode until the next time a connection can be made.
For your reference: https://technet.microsoft.com/en-us/library/gg982959.aspx?f=255&MSPPError=-2147217396
Best Regards,
James