Office Product Key Not Working
If Microsoft Office shows 'Unlicensed Product', 'Product key already in use', or activation error 0xC004F017, the cause is usually a key/SKU mismatch, an exhausted activation count, or a corrupted licensing token. Here's how to fix each case.
Diagnose with ospp.vbs
- cd "C:\Program Files\Microsoft Office\Office16"
- cscript ospp.vbs /dstatus
- Look for ERROR CODE and LICENSE STATUS lines.
- 0xC004F017 → wrong key type. 0xC004C008 → activation limit reached.
Fix 1: Uninstall the bad key and let Ohook re-license
- cscript ospp.vbs /unpkey:<last 5 chars from /dstatus>
- Run OfficialKMSAuto → Office tab → Ohook.
- Ohook installs the correct AAA license and activates.
Fix 2: Delete the licensing token cache
- Close all Office apps.
- Delete C:\ProgramData\Microsoft\Office\Licenses (entire folder).
- Run Ohook again. Office creates a fresh license token.
Fix 3: Reset Office completely
- Settings → Apps → installed apps → Microsoft Office → Modify → Online Repair.
- Wait for the repair to complete (~10 min).
- Re-run OfficialKMSAuto → Ohook.
Fix 4: For 0xC004C008 (KMS activation count exceeded)
- You're hitting the 25-host KMS minimum. Switch from KMS to Ohook for a permanent fix.
- Or wait 24 hours and try again.
Frequently asked questions
▸Why is my key 'already in use'?
Microsoft retail keys are single-use — if you already used the key on another PC, it's burned. Use Ohook instead, which doesn't consume keys.
▸Does Ohook work on Office 365?
No. Office 365 (Microsoft 365 subscription) uses cloud licensing tied to your Microsoft account, not a key. Ohook is only for perpetual builds (2016, 2019, 2021, 2024).
▸Will Online Repair delete my Outlook data?
No. Online Repair only repairs the Office program files. Outlook PST/OST and user settings stay intact.
▸How do I know if I have Volume or Retail Office?
Run cscript ospp.vbs /dstatus — the LICENSE NAME line shows 'VL' (volume) or 'OEM/Retail'. Ohook converts both into an offline permanent license.
▸Is 0xC004F017 a virus warning?
No. It's a licensing error meaning the installed key doesn't match the installed Office SKU. Pure software issue.
▸Can I fix this without uninstalling Office?
Yes — every fix above is non-destructive. Online Repair is the most invasive option but still preserves user data.
New here? Start with the what KMSAuto is, then use the download instructions for file details, SHA-256 and troubleshooting.
Get OfficialKMSAuto Now
Free, safe and open source — supports every Windows & Office release through 2026.
Download Office Product Key Not WorkingComments
Loading comments…