Rivo+ does not work with Waveshare 10.5inch Capacitive Touch AMOLED 2560 × 1600 Monitor

Hello, I am a new owner of the Rivo+. I cannot get the Waveshare 10.5inch Capacitive Touch AMOLED 2560 × 1600 monitor to work with the Rivo+ through the HDMI interface. I have set the Video output options to user interface via HDMI to “on” under “System” in the Volumio app. I have also rebooted multiple times and toggled the “HDMI on” switch multiple times and rebooting. The screen is completely black… Is there something else I need to do to get it to work ? Thanks in advance for any advice.