On certain Model S and Model X vehicles built before November 1, 2021, the vehicle may lack Bluetooth headphone hardware support for the rear touchscreen audio.
NANHTSA · manufacturer bulletin11009775
Service bulletins
Concerns: Tesla Model S (Model years 2021) · Tesla Model X (Model years 2021)
Sources: NHTSA (United States, public domain), Transport Canada (Open Government Licence – Canada), DVSA (United Kingdom, Open Government Licence v3.0), RappelConso and EU Safety Gate (France, Licence Ouverte 2.0).