soundsticks speakers no longer work with MacBook
I have been using my Harmon Kardon SoundSticks 1 USB speakers with my MacBook Pro 15 inch (2018) for nearly 2 years with no problems. I unplugged them from the Mac (using a Thunderbolt to USB adapter). Later, I plugged them back in using my USB hub (and by themselves with the connector) and they do not work. In the sound control panel, a USB Audio CODEC shows (before it said SoundSticks) but if I select it, no sound plays from the Mac unless I switch back to the internal speakers. How do I get my speakers to work again? I am running the latest update of Catalina.
MacBook Pro 15", macOS 10.13