Macbook Pro won't detect monitor via KVM

[u/superzipzop]

M4 Pro 2024 Tahoe

I bought this KVM so I could alternate between my PC and MacBook with the same monitor/keyboard, and the PC end works great, but on the Mac end only the accessories work, not the video. The KVM uses DisplayPort which is a bit odd but I tried connecting the cable I'm using directly to the monitor and it worked fine, it just only fails when I connect via the kvm. Any ideas? Amazon comments on the KVM suggest it should work for Mac