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After following these steps, run slmgr /ato again. If it still fails, the most likely remaining cause is — you may need to manually install an updated Microsoft Root Certificate Authority from a trusted 2024 source.
slmgr /ato If still fails with 0x80072f8f , try phone activation: Windows Server 2008 R2 Activation Error 0x80072f8f
slmgr /ipk <your_KMS_client_key> slmgr /skms <your_KMS_server> slmgr /ato If using MAK: After following these steps, run slmgr /ato again
slmgr /dti This shows an Installation ID. Then call Microsoft activation center. If your server is on a corporate network with KMS: After following these steps
Here’s a to fix Windows Server 2008 R2 activation error 0x80072f8f . What does error 0x80072f8f mean? This error typically means: “The date and time of your computer are not synchronized with the activation server’s certificate validity period.”