While most games nolonger support it and the information on the internet indicates bothe teams, Red and Green, dropped support in drivers I do wonder if it is supported by 3dmark. I can't find anything to indicate either way even in release notes so I would say it is possible but not worth it if you are just gaming as the majority of modern games do not support it.
Hello @killnibbers
Our friend @cpurpe91 is correct. The AMD Radeon RX 6000 Series do not support the AMD Crossfire Technology.