0xC004F225 means the action requires administrator privileges, or the licence isn't applicable for the current edition. In practice it almost always appears because the activation command was run without elevation, so the Software Licensing service couldn't write the change. The fix is usually as simple as running the same step as an administrator.
What causes it
Running slmgr or an activator from a normal (non-elevated) prompt.
User Account Control blocking the licence change.
An edition/key combination that needs admin rights to apply.
How to clear it
Re-run the activation with full rights: right-click Command Prompt and choose Run as administrator, or right-click KMSPico and select Run as administrator — it handles the elevation and the licence write in one step, so the privilege error doesn't recur. Then confirm the result with slmgr /xpr.