Help Problem to enable Accessibility in apps


Android Question

Hello, i have a Samsung Galaxy Note 5. Everything works perfectly but i dont know why it wont let me enable accesibility to any app or even Talkback.
I go to: settings->Accessibility->and under services i tap on any of them->it gives me the option to turn on and i tap on that-> a pop up appears with the options cancel/turn on ->i tap turn on and nothing happens, but it does let me tap on cancel.
Ive restarted it and nothing, im out of ideas. I dont understand what the problem is.
Can anyone help me?