Is it an external microphone with an external preamp or mixer? If so, most of those outputs are professional line level (+4dB), which will overload a mic level input stage, regardless of a soundcard or interface record volume setting. By comparison, mic level is typically -50dB (nominal).
@MARTIN-RIVERA, I'd suggest not using Vegas Capture for now. There are many much better options out there. I'm using NewBlue Captivate but other options include OBS. Your video card may also include a screen capture application. Hopefully Magix will have a better capture app in the future but, for now, I'd use something else.