When using an external keyboard on Android, there is a bug that input is not working if the on-screen keyboard is visible.

The workaround is to set the on-screen keyboard to not be visible when using an external keyboard. It may be different for each model, but you can roughly follow the procedure below.

1. Go to "Settings"
2. Select "Language and Input"
3. Select "Default Samsung keyboard" under "Keyboards and input methods" section
4. Turn off "Use on-screen keyboard"
5. push "Setup input methods" button

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