I tried to open developer option but when i tap the menu it said Turn on developer options first so i try to enable developer mode again by taping build number but is reply No need, developer mode has already been enable

I tried to access it by searching option in setting but when i tap any setting it would tell me to enable developer option first.

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My device is Galaxy A7 (2017) Model number SM-A720F/DS Android 8.0.0


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