In case your application is not under the active mode, a message will flash out on your screen regarding Office activation.After that, you have to tap the “File” option and then hit the “Accounts” tab.If your Office is not activated, then you have to open any of the MS Office applications.In order to troubleshoot this issue, check whether your MS Office is under Activated mode or not.To fix this selection locked issue, you have to follow these simple steps: The complete error message says, “This modification is not allowed because the because the selection is locked.” You might face such error while accessing or editing a particular MS Office Document or folder. It also occurs if you have downloaded more than one version of MS Office or someone is using your MS Office Document secretly. The error message of modification is not permitted because your particular selected is locked flashes due to the inactivation of your MS Office application.