It's also worth noting that the Puck can only be connected to one device at a time - so you'll need to make sure that the 'nRF connect' app is disconnected on your iPhone or you won't be able to see it on your Mac.
edit: also, moving this to the Puck.js part of the forum
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
It's also worth noting that the Puck can only be connected to one device at a time - so you'll need to make sure that the 'nRF connect' app is disconnected on your iPhone or you won't be able to see it on your Mac.
edit: also, moving this to the Puck.js part of the forum