Why can't I enable the system UI tuner?

A

AC Question

Can't enable system UI tuner

I have an HTC one A9. And when i try to enable the system UI tuner by holding in the settings gear button it never starts spinning. when i go in to the software information it says that i have the android version 6.0, and it doesn't say that i have any update to 6.0.1.
 

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