Make sure you gave me the correct PSN name. In searching for BrokenAxles on PSN, there's about half a dozen variants of that name that show up. Some just being axle, some being axles, plural, some with numbers. I sent an invite to the name "BrokenAxles", which has a little white/red/black logo that looks like a tire or something. If that's the correct name, go to the communities tab on the homescreen. Your invite may have popped up there.