New
#11
Restart after disabling the XSplit. May not make a difference but worth trying.
What's left is the possibility the multi jack is the issue. A computer mic needs +5V DC to operate. If that is not being provided it could be a reason the mic is not detected or working. Another problem is the jack or internal components.
Since the separate mic jack works, you could get a splitter, to provide separate TRS plugs for the mic and headset and try that. If that still does not work, it suggests there is a compatibility problem between the headset and your PC (since you reported the headset/mic work in a game console).