
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.



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.
