If you see a "Work or School" account in the Account settings, you do not own the key. Your organization (company or university) pays for the license. You cannot view the key, as it is a Volume License managed by IT administrators.
Your license is managed entirely through your Microsoft account. To activate a new installation, simply download the apps from your account dashboard and sign in. If the app says it is "unlicensed," go to and click Check for Updates or Sign Out/Sign In to refresh the status. Summary Checklist Office 365: No key needed; just log in. Office 2016–2021: Check your Microsoft Account online. how to check microsoft office license key
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Best for: Users who pay a monthly or yearly fee. If you see a "Work or School" account