Increase your display brightness
iOS: Settings > Accessibility > Display & Text Size
Android: Settings > Display
Activate the qr-code-scanner
To activate it, wave your hand in front of it.
You will notice a bright red scanning light.
Present the qr-code to the scanner
Ideal is a size of about 3×3 cm.
Optimal reading distance
The qr-code-scanner is tilted and “looks downwards” at an angle.
A blue waiting animation is shown.
After a short while, a green or red ring is shown.