Can’t connect to Mac mini

The Mac and the iPhone do not "pair" in the normal sense as you would headphones to a computer.

All that is required in most cases is that Bluetooth be enabled on both devices and that they are connected to the same wi-fi network. The same Apple Account should be signed in on each device as well.

If you are trying to sync your iPhone with your Mac, please see: Sync content between your Mac and iPhone, iPad, or iPod touch over Wi-Fi - Apple Support

EDIT - Oops! Here's the link I meant to include: Sync your iPhone, iPad, or iPod using your computer - Apple Support

Macs and iPhones have Bluetooth – but don't pair with each other using it.

You set them up to work with each other in other ways, e.g., using iCloud synchronization, connections to the same e-mail accounts, and Continuity features. Some Continuity features may make use of Bluetooth, but they do that in ways that do not involve pairing.

iCloud+ - Apple

Use iCloud on iPhone - Apple Support

Set up iCloud on your Mac - Apple Support

macOS - Continuity - Apple

Continuity features and requirements on Apple devices - Apple Support

Use Continuity to work across Apple devices - Apple Support