Both are new to me, and I have paired them a couple of times. Both times it took a little while (annoyingly long) to find the Kickr Core Today it (Zwift) never did find.
I am using Zwift on a MacBook, so OS, not IOS. Not sure if that makes a difference, but something is up with the bluetooth, and the Core has nothing to adjust bluetooth with that I can see
Using a Mac you need to make sure you have the right version of BT. If not you’ll need an Ant+ dongle n
What do you mean by paired? With the Mac? The only thing to do is select the trainer in Zwift, not the Mac settings.
Which year Mac?
Kickr probably paired with your phone. Turn bluetooth off on your phone, then turn on the Kickr, wait 30 seconds or so for it to boot up, then open zwift.
Unlike ANT+, bluetooth can only pair to one device at a time. ANT+ just broadcasts so you don’t so much pair as decide to receive a signal on a device.