Why does Office keep saying 'Product Activation Failed'?

This usually means your subscription has expired, you're signed in with the wrong account, or there's a licensing glitch. Check your subscription at account.microsoft.com and try signing out and back in to Word via File > Account.

Fix: Microsoft Office Activation Errors

Fixing Office Activation Problems

Activation errors can appear even with a valid subscription due to account issues, licensing cache problems, or connectivity issues.

手順

Step 1: Check Subscription Status

Go to account.microsoft.com/services
Verify your Microsoft 365 subscription is active
If expired, renew your subscription
If active, proceed to Step 2

Step 2: Sign Out and Back In

Open Word
Go to File > Account
Click Sign Out
Close Word completely
Reopen Word and sign in with the correct Microsoft account

Step 3: Run the Activation Troubleshooter

Go to File > Account
Under Product Information, click Troubleshoot
If no troubleshoot option, download the Microsoft Support and Recovery Assistant
Run the tool and follow its instructions

Step 4: Reset Office Licensing

Close all Office apps
Open Command Prompt as Administrator
Navigate to the Office folder:
- cd "C:\Program Files\Microsoft Office\Office16" or
- cd "C:\Program Files (x86)\Microsoft Office\Office16"
Run: cscript ospp.vbs /dstatus to check current license status
Run: cscript ospp.vbs /act to attempt reactivation

Step 5: Repair Office Installation

Go to Settings > Apps > Apps & Features
Find Microsoft Office or Microsoft 365
Click Modify > Online Repair
This reinstalls licensing components

予防

Keep your payment method up to date for your subscription
Don’t install Office on more devices than your plan allows
Use the same Microsoft account across all devices