In Game Voice Chat Output Device "Invalid"

Have not been able to connect to voice chat server in over 3 weeks. Have tried all the things listed on the forums article. I have checked my settings in Windows and in the game. When I open the voice chat Settings it says ‘Invalid’ under the Output drop down menu. It used to say USB Device and also Default. Now there is no option to select and the only thing there is ‘Invalid’. I need to know how to fix this because I used to use this for random dungeon groups as it’s easier than giving Discord or Ventrilo info every time. Please help me fix this. Thanks!
Also I have complete sounds through my headset, I just can’t use the Mic with the in game voice chat feature. It also works in all my other programs and games with no problems if that helps at all.