Transfer Office 365 license that came with machine to new owner

In March 2019 I bought a Trekstor Surfbook that came with a 2 year license for Office 365. This license is listed in my Microsoft account as being valid until March 2021.
Now I am selling the machine and I would like to transfer the Office 365 license to the new owner.
Can someone enlighten me how to achieve this?
Thanks a lot

Maybe this could help

Transfer Office 365 License To New PC Or Another Computer
How to add a new user in Office 365 or re-assign a license | Netregistry Support Centre

Thanks @

sbh7600
The first one did the trick

Glad to hear