Playback devices not working - Mac OS

Hey everyone!

Yesterday, all of my playback devices worked. Today, none of my Bluetooth devices will connect to Audacity, though they work fine with the rest of my system perfectly.

I tried with an aux cord, and it plays, but at a really low volume. What’s going on?

I uninstalled Audacity, emptied the trash, and reinstalled.
It happens with both WAV and Mp3 files.
I’ve selected the devices in Audio Settings → Playback devices.

I’ve been using these devices with Audacity for weeks with no problems - on both Windows and Mac systems, multiple computers. Right now, I’m on my laptop (which worked yesterday.)

What gives???
Help!!!