I have the very same Problem here.
In addition I bought two Bluetooth Sticks that should work plug and play (Links following) but that don't.. well.. kinda...
The Bluetooth Symbol shows up, I can see devices to connect with, I even can link two devices so it is listed above the others as known devices, but I can't connect. As soon as I try to connect, the loading symbol appears, sometimes there is a code I have to accept (for e.g. iPhone SE), but when I do, the Mac lists the Device as connected for some seconds and then looses connection.
Same thing with Handoff. I can see the Handoff Symbol on the Doc, but as soon as I click on it, it runs in an timeout.
Links:
https://www.amazon.de/gp/product/B00C68IQ3C/?tag=tonymacx8603-21
https://www.amazon.de/gp/product/B007MKMJGO/?tag=tonymacx8603-21 (This one is from the Buyers Guid from this very website, ordered it yesterday.
This card is also from this forum, WiFi works just fine, but the Bluetooth of this Chip isn't even showing up in Mac Informations under USB-Devices or Bluetooth nor elsewhere, it just isn't there.
That's why I got those other two Bluetooth Sticks, that work just fine until a connection should be established.
https://www.amazon.de/gp/product/B00MBP25UK/?tag=tonymacx8603-21
Can someone please help us?
Kind regards,
Kevin van Thiel