Connecting three usb mics

Hi everyone -

I am trying to connect three usb mics to record something on Garageband (MB Air). I manage to create an Aggregate Device with two mics. The third mic simply does not show up in Audio MIDI Setup.

I connect one mic via the left usb slot, I connect the other two via a usb hub on the right usb slot. When I enter a different device (headset) to the port, it does show up. It always shows the two mics I connected first (does not matter whether via hub or directly).

I understand that connecting similar named devices can be difficult, but I just do not get why it shows two identical ones, but does not show the third one.

Do you think it would help somehow to rename the mics? If so, how do I do that?

Any other ideas?

Best

Mo