There's an alarming bug of sorts involved with invites. I've often wondered if half the invites ever get to where they're supposed to. I verified this with a CC member via texting.
He texted me for a match and I said OK. I already had the game client open and was green. I waited a minute or so and then texted him to send the invite. He said he already had! I refreshed the browser and then the invite showed up.
It appears invites are hit or miss these days. Great for all the community tournaments going on. :-(