On machines, we could only find the last 5 characters of the key via running commands as following. To protect your product key, Microsoft will not show all 25 characters of the key.
Search CMD, right-click the Command Prompt and run as administrator. Then copy and paste the command in it, click Enter at last:
cscript.exe "%ProgramFiles%\Microsoft Office\Office16\ospp.vbs" /dstatus
(If you are running 32-bit Office on a 64-bit operating system)
cscript.exe "%ProgramFiles(x86)%\Microsoft Office\Office16\ospp.vbs" /dstatus
If you need further help, it's better visit Microsoft support page for assistance (Please remember to jump to manual service).
Thanks for your understanding.
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.