A family of Microsoft word processing software products for creating web, email, and print documents.
Which error message do you see?
If the problem started Mid July, the cause might be that you are running an older version of macOS. You'll need at least macOS Monterey to run Office on your Mac. See https://support.microsoft.com/sv-se/office/lifecycle/officeinstall/update-m365-office-macos-ios.