Microsoft Genuine Advantage Diagnostic Tool Validation Unsupported Os May 2026

If you need to diagnose activation issues on a modern OS, stop using the MGA Diagnostic Tool and try these instead:

This diagnostic tool was originally designed to verify licenses for legacy systems like . Because Microsoft has shifted to newer activation technologies, this specific tool is no longer compatible with modern versions like Windows 10 or 11. Why You're Seeing This Error If you need to diagnose activation issues on

:Go to Start > Settings > Update & Security > Activation . Windows 10 and 11 have built-in troubleshooters that replace the old standalone tools. If you need to diagnose activation issues on

: The tool (MGADiag.exe) is generally for Windows 7 or older. Running it on Windows 8, 10, or 11 will trigger the "unsupported OS" message. If you need to diagnose activation issues on