I solved this problem by my own — need to disconnect bluetooth device (JBL) from iPhone first. Otherwise you can connect to JBL from mac, but macOS donesn’t detect JBL sound device.
If you are AirPods owner — you can’t use easy JBL switching feature like AirPods. You need to:
— note which of your devices JBL speaker is currently connected to;
— disconnect your JBL speaker from currently using system bluetooth devices following user manual;
— go to your new device system bluetooth devices and connect JBL speaker following user manual.
Do this steps every time you need to switch device (suffer).
JBL is not Apple, i hate this speaker, but it sounds good.
Best regards.