Процессы в Microsoft 365 для настройки Приложение Office, активации ключей продуктов и активации лицензий.
Honestly, I don't know what happened when I first logged in to my account with the office installed, but then I got the error message "this copy of office is not activated", and then the purchase disappeared from the list in the store you were talking about
I assume that the office was registered to another account, but then why could I use it freely?