When I toggle on the install via USB in developer mode:
I will write what worked for me, these other solutions did not work out.
switch "Install via USB" to ON,
When the dialog box "Allowing" appear, quick tap your screen out of the dialog box.
Repeat it until u see that "Install via USB" is ON.
After u see "Install Via USB" is ON, you need to re-checking by pressing back button and go to developer option again.
This worked for me. Thanks.