SWMBO uses bluetooth Apple to gadgets more than me. With her Cambridge speaker, she presses a button on the Speaker, having turned off both Apple and Cambridge. Once it has recognised it, it is fine.
When she connects to my pride and joy hi-fi, via a Logitech gadget, it required a button on the top of the gadget to be pressed, again after turning both off, and back on again.
I nearly had to read the instructions!!