TikTok Shop requires the first product image to be a clean front view with no overlaid text, badges, stickers, or mosaics. Otherwise the listing is rejected.
TikTok Shop / TikTok Catalog Manager requires product images that are publicly reachable, sized within the platform's bounds, in supported formats (JPEG/PNG typically), and free of overlays, watermarks, retailer logos, or text callouts. This issue trips when one of those constraints is broken.