Official comment
Two things...
1) If, when you installed the drivers, you didn't allow them through the driver security, you'll have to use the uninstaller (found in the driver package), then reboot, reinstall, and bypass the security.
2) You may not have enabled the input for the mic (even though it's a line input, it's in the same place) - go to System Preferences > Security & Privacy > Privacy > Microphone:
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