[Smush Pro] Smush not displaying images from CDN

I am having a real headache with smush cdn. Basically for this particular website (which is quite image heavy) lots of images simply don’t display. I am not sure which part of the CDN it is (scaled images, webp, cdn). But each feature seems to cause the problem. I have had to disable this feature completely. Are you able to debug this at all. I have granted access. It is not possible to put it on a staging site as I don’t have space on the harddrive unfortunately.