There is a horrible non-obvious quirk of the Adjust­Token­Privileges function that is tripping us up: The function returns success even though it may have failed to do what you asked.
The function “succeeded” in the sense that it successfully attempted to adjust the privileges you requested, and it successfully reported the result of the adjustment attempt. But that doesn’t mean that the attempt actually accomplished what you asked it to do.

https://devblogs.microsoft....0211126-00/?p=105973