ATEM Multiview SDI/HDMI setup

Using an ATEM 1 M/E. Would like to set it up so that I can access both the HDMI and the SDI outputs for running the Multiview simultaneously on two different screens. I have the HDMI running without a problem, but am unable to get the SDI to work (even with HDMI unplugged). Is there a software setting that needs to be changed in order to switch between one or the other or set for both to use? I have scoured the settings and all so the manual and can not find it. THANK YOU!