I run Linux and used sudo bluetoothctl scan on to find the MAC addresses. Apparently, Home Assistant my not have bluetoothctl or hcitool avaialble in a terminal depending on how you have it set up. I am not sure where in the documentation this is being referenced but if you look at this post it using BLE scanners available on the Google Play Store and for Windows in the Windows Store. I was able to use BLE Explorer from F-droid on my Android phone to find the MAC address. I am not sure what is available if you only have Apple products
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