slmgr /ipk <your_KMS_client_key> slmgr /skms <your_KMS_server> slmgr /ato If using MAK:
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 May 2026
slmgr /ipk <your_KMS_client_key> slmgr /skms <your_KMS_server> slmgr /ato If using MAK:
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. Windows Server 2008 R2 Activation Error 0x80072f8f
slmgr /ato If still fails with 0x80072f8f , try phone activation: slmgr /ipk <
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