Product key for Windows?

In the beginning, my laptop was broken during the repair, the hard drive was replaced and now I can no longer use Office incl. PowerPoint etc.

I think I need the product key to activate, but I have no and do not know how to proceed now or where I find this.

can someone help me?

That you have with the device acquired, sometimes looked at the documents or on the back of the device?

Take a look at lizengo, there are cheap and good keys.

Yes, unfortunately nothing to find! Have a Windows 10 device, there's perhaps no code?

So the Win10 should unlock itself alone and the office was probably extra. For this you need the unlock code from the purchase documents.

How old is the laptop? Was this warranty repair? With warranty - off to the workshop!