1, Your office 2016 is stand alone installation or upgrade from Office 365?
2, upgrade from Office 365, it will become office 365 base Office 2016 version after activation. That meant you still can upgrade to office 2019 if you use Windows 10, and keep on get future office version upgrade.
3, If you install stand alone Office 2016 beside Office 365, batch file office 365 no way activate Office 2016.
4, Office 365 in the market very long time, Microsoft make client easy. If your internet speed fast enough, Windows 10 will automatic upgrade to Office 2019 when install Office 365.
5, If before you use Office 2016, new install office 365, activation will get all sort of problem.
Before use Office 365, you must first uninstall all old stand alone office version from your PC or Laptop.
See which case suit you most, do it , restart PC,reactivate afterward.