Well, it certainly sounds like you have checked all of the boxes. I still do not know what the "Red X" may mean. It either means your device is not supported, or it thinks that a webcam is not connected.
For the benefit of others who may see this thread in the future, here is the link to the EOS Rebel T7 Product Support Page.
A good test of your setup is whether or not you can run the regular EOS Utlity to download files. A better test is whether or not you can use the regular EOS Utility for Remote Shooting. If this works, then we know your cable is good. Besides, it seems like the Webcam Utility might need something that that the regular EOS Utility installs on the system.
If it does not work, the problem could be either your cable or the USB port on your computer. Try all of the ports on your computer. Some users hve reported that USB ports on the front of their tower PCs do not work, but the main port on the rear of the PC would workl. This caused by some USB ports are actually coming off of an internal USB port expander. Canon cameras and USB port expanders do not seem to like one another.
Which brings us to your atual PC. So, what make and model of computer are you using. Just running Windows 10 only partailly meets the requirements. There are hardware requirements, too, which have to be met. They might look like this.
An Intel chipset seems to be preferred over an AMD chipset. There's someting about the AMD USB ports that Canon cameras do not like. No idea what it might be, but I have a few good guesses.
Finally, you need to make sure tha tthe EOS Utlity Launcher Service is not running when you try to use the Webcam Driver. There is an icon in the System Tray that shows you when it is running. If it is running, then the Webcam driver seems like itis blocked from accessing the camera by the EOS Utility Launcher Service.
If this is the image you were getting like I was make sure that your cameras Wi-Fi connection is disabled as having the Wi-Fi function on will disable the cameras HDMI, USB ports. Which will prohibit the camera from connecting to your computer. It took me hours before I read the prompt it gave me when I was trying to get my camera to connect to Wi-Fi on my computer. When I disabled the Wi-Fi feature the camera finally connected.
