The same thing has just happened to me! I bought Office package when I bought the computer and installed it. It's been working fine until today. Now it wants me to activate Office, and everything has been frozen until I do. But when I try and log on it says that it is already installed on another device. It's very very very important for my work that I get this working again today!
Do you have any suggestions, please?
This could be a new issue, since multiple posts on the topic has cropped up recently.
However, first of all, how did you purchase Office? Did you purchase it in a store with the computer? Or did you purchase directly from Microsoft?
Which specific version of Office is this? Which operating system?
During the install process, were you guided to create a Microsoft account?