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This error message usually appears when you are trying to activate macOS (or an Apple server application like macOS Server) and the machine cannot establish a valid, secure connection with Apple's activation servers.

10 minutes

After the reboot, reconnect to Wi-Fi. Wait about ; the Mac may then activate successfully on its own. 4. Advanced Troubleshooting

: Ensure the "macOS Device Activation" service is operational by checking the Apple System Status page from another device. Restart and Retry