This is regression from older portal. The older portal contained this information:
openscap won't have SCE support by default, you have to pass --enable-sce to ./configure to get SCE support. Up until 0.9.12 SCE was inbuilt into libopenscap.so, since then it is built separately into libopenscap_sce.so and loaded as a plugin at runtime (if it's available).
Package repository (only for openscap > 0.9.12)
If you are using openscap from your package repository, check whether you need to install a supplemental package. For example in Fedora openscap SCE engine is packaged as "openscap-engine-sce". To enable it, execute:
# yum install openscap-engine-sce
This is regression from older portal. The older portal contained this information: