StreamYard is not compatible with NDI itself, but there is an advanced workaround for this. You can use a virtual camera that is NDI compatible, like OBS Virtual Cam. OBS recognizes NDI sources and can turn them into a webcam source. Then on StreamYard, you will choose the virtual cam as your webcam input. You will also need a virtual audio mixer like Voicemeeter to bring the audio in from OBS.