Enabling accessibility options

When I try to turn on accessibility settings like for nova launcher or greenify I move the slider to the right and a box pops up giving me the options of yes or cancel. When I try to hit yes nothing happens so I have to hit cancel to close the box.

Any help is very appreciated. (Not rooted).

Sent from my XT1575 using XDA Free mobile app

OEM Unlock isn't an option after enabling developer options

I am trying to unlock download mode on my HTC One M9 running 5.1 in order to root, but when I try to get an identifier token from htc via cmd, it comes up with an error about enabling oem unlocker. I've scoured my dev options but cannot find this checkbox. Is anyone else having this problem or know a solution?