Why secure folder not working in my samsung c9 pro

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A

AC Question

When i try to use secure folder then a message shown on screen that "secure folder can't set up beacuse unauthorized software was installed on the device !
Can anyone help me with this problem ?
 
You installed something (rooted the phone? a different ROM? an app?) that messes something up. If you didn't root the phone or flash a different ROM, restart in Safe Mode and see if it works then.