Install app via usb: The device is temporarily restricted

Question

When I toggle on the install via USB in developer mode:

• it will pop the toast message said that the device is temporarily restricted

Answer 1

In my case,I was using my phone that is Redmi 4 and the usb debugging was not working.It was always giving the message "the device is temporarily restricted" .I have tried all this steps but the result was same.Then I found the foolish thing that I have put the device in charging mode only.When I switch to MTP(Transfer files) and then it started working correctly.I know its a foolish thing but it may help to someone.