iPhone XR will not pair with Bowers and Wilkins PX headphones

I have a new iPhone XR and have paired it with the Bluetooth in my car and with my wireless speakers at home. However, when I attempt to pair it with my Bowers and Wilkins PX headphones it never detects them so it never pairs. I have already read several solutions offered online without success. The headphones have paired in the past with other iPhones, just not the XR. Any help would be appreciated.