After publishing a print service with custom layouts from ArcGIS Pro 3.1.3 to ArcGIS Enterprise 11.1, I received the following error when trying to print:
Error executing tool. Export Web Map : ERROR 000820: The parameters need repair. ERROR 000800: The value is not a member of Portable Document Format (PDF) | 32-bit Portable Network Graphics (PNG32) | 8-bit Portable Network Graphics (PNG8) | Joint Photographic Experts Group (JPG) | Graphics Interchange Format (GIF) | Encapsulated PostScript (EPS) | Scalable Vector Graphics (SVG) | Compressed Scalable Vector Graphics (SVGZ) | Adobe Illustrator Exchange (AIX) | Tag Image File Format (TIFF). ERROR 000820: The parameters need repair.