I have an issue with a dongle that can not connected to my mac mini with macOS katalina 10.15.7.
There are many similar questions but none of them worked for me, such as:
OSx doesn’t want to activate my Bluetooth dongle
Force OS X to use Bluetooth dongle instead of built in controller
I tried to activate my dongle via the Bluetooth explorer tool, but it does not show my dongle as [ACTIVE], and also the address of the Bluetooth remains as the built in one:
it does try to activate it – I see a twisted line on the Bluetooth icon and a loading circle, but again, the address stay the same.