@Aryan for oscdimg, which you will need to make any new ISO, you need to grab that easy ISO package and 7-zip extract its contents instead of running the .exe (Easy ISO) in there. (or you can use that tool too, but it does not set a volume label. Nevertheless it's good for quick testing.)
oscdimg.exe" -m -o -u2 -udfver102 -lWIN10_IOT_6456 -bootdata:2#p0,eb"D:\iso_path_extracted\boot\etfsboot.com"#pEF,e,b"D:\iso_path_extracted\efi\microsoft\boot\efisys.bin" "D:\iso_path_extracted" "D:\path_to_destination\Win10_IoT_LTSC_6456.iso"