Hi Knut,
Office 365 activation requires the Internet Connection to communicate with the Office Licensing Service and the Activation and Validation Service to obtain and activate a product key.
In his network, please make sure his network settings are correct and no blocking for Microsoft services. If the activation still fails in his network, collect more information about the license status for further analysis:
Run as administrator to open Command Prompt window, type the following and share the complete results to us:
cscript.exe "%ProgramFiles%\Microsoft Office\Office16\"ospp.vbs /dstatus
If you are running 32-bit Office 2016 on a 64-bit operating system, the script is:
cscript.exe "%ProgramFiles(x86)%\Microsoft Office\Office16\"ospp.vbs /dstatus
Best Regards,
Winnie Liang
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