I'm not able to display both PCs at the same time, each PC on a separate monitor. All connections are correct. Is there anywhere I can get support?

That is not how KVMs are supposed to work. It is one or the other computer at a time. What you are likely looking for is a switchable USB hub if you are only looking to switch the Keyboard and Mouse only while keeping the monitors displaying from both computers simultaneously. (or you can likely just plug the monitors directly into the computers and use this for only the mouse/keyboard)

Questions & Answers: AUBEAMTO 2x2 HDMI DP KVM switch 4K 144Hz Dual Monitor Extended Display 8K USB KVM Switcher 2 in 2 out for 2 Computers 2 Monitors

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AUBEAMTO 2x2 HDMI DP KVM switch 4K 144Hz Dual Monitor Extended Display 8K USB KVM Switcher 2 in 2 out for 2 Computers 2 Monitors

8K HDMI DP USB 3.0 KVM Switch allows you to share one USB keyboard, USB mouse, and one HDMI monitor & one DP Monitor to control 2 computers, laptops, game consoles with extended mode and mirror mode.
It is designed for multitask with two computers at your necessary, increasing productivity in the office or at home ; You can switch between 2 computers using a manual switch located on the top of the KVM unit.
Features
- Product Type: 8K HDMI DP USB 3.0 KVM Switch (2 in 2 out)
- Input Port: HDMI 2.1 x 2,DP 1.4 x 2,USB 3.0 data x2, USB 3.0 x 4
- Output Port: 1 x HDMI 2.1,1 x DP 1.4
- Material: Aluminum Alloy shellanti-rust, anti-corrosion, anti-interference, fast transmission, surtace oxidation
- Support HDMI 2.1 HDCP 2.3 / Displayport 1.4
- Resolution: Support 1080P/1080@144/165/240Hz, 2K@120/144Hz, 4K@60/120Hz,8K@60Hz resolution, adaptive screen resolution
- Support system: Windows XP, Windows7/8/10 and above, Apple MAC, Linux, Unix and other operating systems

$109^.99 –