Cannot pair iPhone w MacBook --error “MacBook pro is not supported"

Bluetooth pairing an iPhone and a Mac is not supported. 

If you are attempting to use Handoff/Continuity or AirDrop, that does involve Bluetooth but the devices are NOT paired; Bluetooth just needs to be on and the devices in range of each other. The following may help with Handoff/Continuity issues: Use Continuity to connect your Mac, iPhone, iPad, and Apple Watch - Apple Support

Also see Share files between your Mac and Bluetooth devices - Apple Support

And see the information in: Bluetooth: Why can't I pair my iPhone or … - Apple Community

David Moore3 wrote:

Cannot pair iPhone w MacBook --error “MacBook pro is not supported" after going through the steps, including restarting

That is correct, 2 can't pair 2 Apple devices together via bluetooth unless for tethering.

What are you trying to do?

David Moore3 wrote:

Use my phone as a hotspot via bluetooth

Click here to troubleshoot If Personal Hotspot is not working on your iPhone or iPad (Wi-Fi + Cellular) - Apple Support