What Firewall settings needs to be enabled for Airdrop? Which option in the built-in firewall in System Preferences needs to be enabled to allow AirDrop to receive files on a Mac?

The Mac can currently see iPhone's and other devices in Airdrop, but does not show on the iPhone as a target for Airdrop.
Open System Preferences -> Security &amp; Privacy -> Firewall
Select Firewall Options
In the list set "sharingd" to "Allow Incoming Connections"


Alternatively, tick "Automatically allow built-in software to receive incoming connections"