NFC on SONY WH-CH710N works for me with the X10.
When Blueetooh is active on the device and I hold it to the headphone’s NFC logo, the phone vibrates shortly and then connects. Initial pairing was performed the “classic” way however. Haven’t tried that with NFC.
“Bluetooth Secure Simple Pairing” has to be active in the Sailfish NFC settings (just saying in case…).