ATEM and zoom

My setup is three canon vixia cameras going into an atem mini (not pro). and output to a laptop via the usb c connector. I use a large monitor to view the hdmi output from the computer. I use a bluetooth around the neck headset for mic and speaker. Everything works fine until I go to share screen. The share screen appears to go out BUT I can't get the video back to show on the large monitor. I have tried to loop the computer hdi out back to the mini, as channel 4, and the HDMI out from the mini to the monitor but that doesn't seem to help. Does anyone know how this is supposed to work????