I feed beans, however, all beans are soaked for a minimum of 8 hours, rinsed, then cooked 10 mins. at full boil, and another 20 mins. at simmer. I don't feed soy beans of any kind, just a personal thing I have about soy.
The only bean I use for sprouting are Adzuki. Mung beans can also be sprouted, but .. can cause flare ups of yeast infections if a bird is prone to them, so I'd rather not take the risk, even though I've not had a yeast problem.
The trick, I believe, to feeding beans safely, and utilizing their valuable proteins is being sure they are well cooked.
JMHO