Once you have attempted the solutions above, force the activation to ensure the changes took effect: Open the Command Prompt as Administrator. Type slmgr.vbs /ato and press Enter.
Microsoft has moved toward TLS 1.2+ for activation servers, which may not be enabled on older Windows Server 2008 R2 builds. windows server 2008 r2 activation error 0x80072f8f work
The activation process for Windows Server 2008 R2 uses HTTPS. For that handshake to succeed, the client (your server) and the server (Microsoft) must have roughly synchronized time. Why? Because digital security certificates have “valid from” and “valid to” dates. If your server’s date is off by even a few minutes, Microsoft’s server will reject the certificate as expired or not yet valid. Once you have attempted the solutions above, force