I have the same problem with my A4 since upgrading to Mac OS Catalina, even with the newly released Overbridge 2.0 full release. Computer is a MBP 16".
When connecting it through an Overhub it says “measuring” indefinitely. If I connect it directly to the computer is switches to “fault” after 20 secs.
Tried the suggestion here: https://www.elektronauts.com/t/overbridge-2-0-12-public-beta-au-plugins-stability-improvements/88798/47
If I do this and hit apply I only get a message saying that the configuration can’t be applied due to bandwidth could not be allocated…even though it’s just 16 bit, 2in/2out.