I had an experience that might help you.  I'll try to tell the short version, and you can ask more questions if necessary.

I moved my camera too far back, so I was "outside" of the sky dome.  It looked okay in iClone, but in Iray all I could see was the sky (very blurry, because the camera was very close to the outside of it, so it was zoomed in and pixelated).

By default, Iray does not comprehend a one-sided surface, since it is not physically meaningful, generally speaking.  You don't tend to find things in the real world that are visible when viewed from one side but then are invisible when viewed from the other side.  ("Two-way mirrors" would be an exception to this, and it takes extra steps in Iray to support that.)

So...  it's possible you have a one-sided surface between your camera and your objects.  Other than zooming in, you can set the Iray clipping to be something like 50-to-9,999, and that way it will exclude the blocking surface that's close to the camera.

Did that make any sense?

---

iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD