Upon trying to trade with the payment of "Any CS:GO Key" I am told that my backpack does not meet the requirements. I tried with regular crate keys and it went through.

We will update you here when we add it to Any CS:GO keys.

We have problem even updating the CS:GO item schema to include Chroma Key...everything about CS:GO is always down or something.

I was able to post a trade involving chroma keys today, thanks Joto!