MiniPOS APQT - "Error: Contactless card application selection failed"
This can occur on the MiniPOS (APQT) device.
The wifi must be off completely when doing a transaction on MiniPOS (version 1). Drag menu down with your finger from the top of the screen to put the wifi off. If Wifi WAS off, Retry the transaction and make sure you hold the card long enough to process the tap.