Why my account is not working on a new Mac OS?
Due to the new Mac OS update, the Mac system has forced apps to request certain types of system privileges that were generally allowed in previous releases.
In case you have updated your Mac to the new "Mojave" OS, you might receive prompts or warnings that you have to approve or add the DeskTime app to the Security & Privacy system preference pane’s Privacy tab.
In order to allow DeskTime to keep tracking your time, you have to allow it in the computer settings. Go to System Preferences -> Security & privacy -> Automation. Then, checkmark through which web browser you will be continuing using the DeskTime app.