External Mic and Headset (USB) not working together

[iwani88]

Hey,
So I would like to use my external mic which has a XLR to 3.5mm but when I plug the mic my headset which uses USB stops working, and even the mic (XLR) doesnt work.....

 

[scout_03]

the system ask for one choice either usb or 3.5 mm so that why they dont work in the same time .