The issue with this, as with any sort of localisation, comes down to ‘assumptions’. By this I mean people assuming that others think, see, perceive and interpreter the world as they do.

The original app icon will still be there, but you can hide it from the home screen to avoid confusion. Just hold your finger on the screen until the icons start to shake and click the minus sign.

With a bit of luck, your custom dark mode icon will look the part on your personalized Home Screen. Note: If you have several app icons that you want to create dark mode equivalents for, make sure ...

To do this, tap the Duo icon at the top right of the screen, scroll down to Super App Icon or Max App Icon, and tap Turn On..