How to Install Office 2016 that came with the HP Probook x360

[Microsoft Windows]

I have a HP Probook x360 that was given to us by our college. But Now after graduation, since some errors were showing up and I thought of formatting the laptop to make it easier. But after reinstalling windows, I am unable to install the Microsoft Office 2016 Professional Plus version that came with the device. Since the windows automatically activated, I believe it is hardware licensed and similarly to that with the BIOS. So can anyone help me either how to find the product key or how to activate it?

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