In my case the integrated AirPort Extreme card was broken on the Macbook Pro. Tip! Cheap macOS compatible Bluetooth USB dongles here on eBay. But you need to install some software just to enable it.
It’s readily available used by many dongles, inexpensive and works easily without drivers. Looking for an easy to install Bluetooth USB dongle for your Mac or Hackintosh PC - I recommend the Broadcom BCM20702 Chipset.
