For the best iCloud experience, make sure your device meets the minimum system requirements.
Activate Office 365 versions of Office for Mac. If your organization has an Office 365 (or Microsoft 365) plan, make sure you assign each user a license for Office before you deploy Office for Mac to your users. If you don't assign a user a license, you can still deploy Office for Mac to that user, but the user won't be able to activate and use Office. Enter the code displayed on your device. I purchased Office 2016 for Mac, downloaded, and installed it. No screen came up to activate it. All the online helps say to activate through the screen that pops.
Activate Outlook For Mac
Use the latest version of macOS
Update to the latest version of macOS. Choose Apple menu > About This Mac > Software Update. If you’re using macOS Mojave or earlier, choose Apple menu > App Store. See if there’s an update available.
Sign in
Choose Apple menu > System Preferences, then click Apple ID. If you’re using macOS Mojave or earlier, click iCloud. Enter your Apple ID. When you sign in, iCloud is turned on automatically.
Check your iCloud settings
Choose Apple menu > System Preferences, then click Apple ID. If you’re using macOS Mojave or earlier, click iCloud. Choose the apps—like Notes, Photos, and iCloud Drive—that you want to use with iCloud.