Unable to subscribe to (Q)uotes channel in websocket client

[wilmorrtr]

I am able to successfully subscribe to the Trades channel, but when I attempt to subscribe to the quotes channel, I get an error.

My request: {"action":"subscribe","params”:”Q.AAP”}

Error returned: [{"ev":"status","status":"error","message":"Invalid JSON"}]

I understand my subscription call may be incorrect, but I've been unable to find any reference (other than a table showing channels T, Q, A and AM. I'd appreciate any assistance you can give!