Black Screen if I don't use SLI/Crossfire Capture Mode

Hey guys, I've been trying to stream/record Brawlhalla, a 2d game. But, if I don't enable Crossfire Capture Mode I'll get just a black screen. The problem is that with SLI/Crossfire Capture Mode turned on my fps in the game drop a lot. I've tried many different settings and none of then worked. How can I fix this? My PC specs are:
GTX 1650
I5 9° Gen

Thanks and sorry for my english, is not my native language.