How to clear an office 365 install from the account of the previous user when the previous user is not known?

I am assigning a used laptop to a new user.  The laptop has Office 365 ProPlus pre-installed.  When I open any Office app and go to the 'Account' page, under subscription product it says Belongs to c******@re*****.com

I do not know who this previous user was.  How can I clear their account off of this machine without knowing who they are?

The new user has their own E3 license.

Thanks for pointing me in the right direction.

In the past, when I have known who the previous user was I would just have them log into the Office 365 portal and go under 'installs' and remove the machine name they are no longer using.  I dont know how to do that without knowing who this user is.   I am thinking there must be some way to clear it my machine name in the admin portal?  I hope!
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FOXActive Directory/Exchange EngineerCommented:
open command prompt as an admin and run both commands below

cscript.exe "%ProgramFiles(x86)%\Microsoft Office\Office16\ospp.vbs" /dstatus

(Note the last 5 digits of the key and put them below after unpkey:)

cscript.exe "%ProgramFiles(x86)%\Microsoft Office\Office16\ospp.vbs" /unpkey:XXXXX

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snyperjAuthor Commented:
Perfect.  thx
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