What it is
Tag 9F6E has no single meaning — it is defined differently by each contactless kernel, which makes it a frequent source of confusion. Depending on the scheme it is the Visa Form Factor Indicator, the Amex (Kernel 4) Enhanced Contactless Reader Capabilities, or Mastercard Third Party Data. You must know the active kernel before interpreting it.
Where it appears
Card-side (Visa FFI, Mastercard) or reader-side (Amex) depending on the kernel.
Specification reference
Defined in: Kernel-specific — EMVCo Contactless Book C-3 (Visa FFI), Book C-4 (Amex reader capabilities), Book C-2 (Mastercard Third Party Data)
Meaning by contactless kernel
Kernel 3· Visa
Form Factor Indicator (FFI) — describes the physical form factor and features of the payment device (card, phone, wearable) and its contactless capabilities.
Kernel 2· Mastercard
Third Party Data — optional data such as a device or wallet identifier carried through the transaction.