This warning will appear on your computer monitor screen if the office you are using is not official or you have not purchased an official or new office product.
This warning will appear if you open one of the office programs such as words, excel, powerpoint and others, then a warning will appear in a popup that product activation has failed.
This warning has no effect on office use, you can still use it but there are certain features that cannot be run because they have not been activated. But in general all can be used normally.
This POPUP warning can be removed in the following way: