Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
https://office-watch.com/2018/japan-special-place-buying-microsoft-office/
Japan is a special country in many ways, even when it comes to buying Microsoft Office. The Japanese can buy Office in ways that Microsoft have dropped for the rest of the world.
Office 365 Home and Personal plans are sold, by Microsoft’s count, in 246 countries and territories but not Japan.
Microsoft Japan has its own arrangements for selling Office 365. Neither the Personal (single licence) or the more popular Home plan (five licenses) are available.
The only ‘subscription’ option is Office 365Solo. It’s a TWO license product as Microsoft says “can be installed on two Windows PCs or Macs used by the same user.”