stereo mic is only single channel

I have a stereo microphone plugged into an audiobox USB interface. On 18.04 audacity recognized both channels but in 20.04 only a single channel is coming through.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: audacity (not installed)
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed May 27 11:38:06 2020
InstallationDate: Installed on 2020-05-27 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: audacity
UpgradeStatus: No upgrade log present (probably fresh install)