The bluetooth pair macro only makes UHK refuse already-known connections, thus helping to pair new devices in an environment where multiple bluetooth device fight for UHK.
You should see your UHK in ble scanning out of the box without any macros. In theory that is.
There are some bugs on 13.0.0 and 13.0.1 regarding advertising though. They should be fixed on [Dev build] Testing request: Bluetooth ble-hid-to-ble-hid switchovers - #8 by Tunney, but it contains some other new problems 
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Admittedly, the bluetooth pair or bluetooth advertise macros may kickstart advertising when some of the bugs makes advertising die.