Make sure the dot has been activated beforehand.
iPhone 7, iPhone 8, iPhone X, and older must use the NFC scanner in the control center.
Your phone must be updated to iOS 14.
dot cards can not be scanned while:
the flashlight is ON
the phone screen is OFF
their phone is in Airplane Mode
the camera is Open
*Note that the tap feature will not work while the camera is open. As an alternative, scan the custom QR code available on your dot.Profile by using your camera app. A link should pop up which will take you to the dot.Profile.