Start any Office app again and follow the activation prompts.Personally-Owned computers: Download and run the License removal tool to remove all the Office keychain entries.Izzy-managed (University) computers: Go to Applications -> Utilities -> Service Provider Support, find the "Office 365 License Removal Tool" and click the "Remove" button.If the page loads, your internet connection is working.You can do this by opening your internet browser and going to.Make sure the internet is working on the Mac.The error code is: 0x0" Resolution Activation Error The error code is: 0xD000000C" or "Unknown Error. An Unknown error has occurred. Attempting to activate or use Office 365 on Mac and a component crashes or you receive the error, "No credentials / The system requires that you sign on to a valid account.
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