If you are signed in with a network account, sign out and sign back in with your local user account.If you've signed in to your Mac using a Network account such as an Open directory account, this error may occur because Office for Mac can't write your credentials into the keychain as it is 'read-only.' 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. I didn’t want to be in violation of my service agreement with Microsoft so I decided to deactivate the serial from 2 of those 3 computers.Īfter a great deal of searching with my incredible Google skills I found the only way to deactivate a serial in Microsoft Office 2011 for Mac.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. I didn’t even mean to find this out and, after purchasing 5 different copies, I mistakenly used the same serial on 3 different computers and have not received any errors when working in the program simultaneously.

This is probably because they also did not put any mechanism in place to stop you from installing your version of Microsoft Office 2011 for Mac on as many computers as you want. Microsoft did not make it very easy to deactivate a product key for Microsoft Office 2011 for Mac.

License removal tool for office for mac