If the charger you are attempting to use does not have a QR code on a sticker or LCD screen like shown below, you will need an access card.

You will also not need the mobile app, as access card charging is handled separately from mobile app QR charging, so you can delete it.

You can learn more about how to sign up and get an access card here: How to Sign-Up & Activate Your Access Card

Please note: All chargers have a QR code on them near where the serial number is (as seen below). This QR code does NOT enable charging.