Can't activate office pre-installed on the notebook.!

[SAPKOTA_SHELP-1]

Two month ago ,We specially  bought a HP notebook which came with Microsoft office home and student 2016 . After inaugurating 😀😁 my laptop , I immediately opened word ; suddenly I was directed to the dialog box suggesting to activate my  office product . After  then I spent some time trying singing on with two of the Microsoft account I used on my laptop . It was not activated and it was even more nightmare for me  to know that I had no office product key . I was , and am unable to activate my office product .
so , I seek for proper enlightenment .

[banhien]

@SAPKOTA_SHELP-1 

Your machine has nothing called pre-installed, only  FreeDOS 2.0:

     https://support.hp.com/au-en/document/c06033195

Normally MS Office is a TRIAL version and after few months if you wish to continue to use you have to pay Microsoft for it.

Regards.

[SAPKOTA_SHELP-1]

My notebook came with pre included Microsoft office home and student 2016 . It even has a sticker on it labelling " Microsoft
includes; Office home and student 2016 " . The real problem is I can't activate office with any of my Microsoft account and I even donot have office product key with me .