I try to install app via adb and get a error:
$ ./adb -d install /Users/dimon/Projects/one-place/myprogram/platforms/android/build/outputs/apk/android-debug.
Im using Xiaomi Redmi Prime 3S, Non of the above method worked for me. This frustrated me
what i tried was, i signed out from Mi Account and then created new account. tada... after that i can enable USB Debugging. Hope this helps.