Two USB cameras

I am currently trying to set up the virtual camera in Manycam (tried 7 and 8 studio) so I can switch between two cameras filming from different angles. I need to crop the picture so I can’t just use them directly. Also, I want to be able to switch to my shared desktop.
However, only one camera will work, the second stream says the camera is in use elsewhere. This is really frustrating because I thought that that was what MANYcam was for.
Tried a Razer Kiyo, Logitech C922 pro and a third USB webcam. It’s always the first that gets recognized and works, All three are in my Windows 11 settings.