Not working for me either...

Same deal. I was logged into live. got my code. Went online, linked it, and nothing happended on my Xbox. I even exited the game and came back in.

Same problem with the Playstation Network on my side. I was linked with my Rockband 2 game though. Maybe this only works with a "first time linking" into the system? Was everybody else who is also having problems also linked with Rockband 2 first?

I'm on PS3, and I guess I must have linked on RB2, and I haven't gotten it, but it is tracking my gameplay. I don't know anything else I could try to get it to work, but I have seen notices here that some people got the achievement, so it's working for somebody.

I did that w/ no luck.

I also had my account linked from the RB2 days, there isn't even an option anymore to link the RB3 code.

No achievement for me either.

Had my account linked for weeks now. Progress is shown on site, no achievement in game. I've tried entering the code on the site multiple times, each time it says that I've unlocked the "Well Connected" achievement. Lies.
Normally, this wouldn't be a huge problem, but some fool over there decided to make 4/6 point achievements. I guess because they know a lot of people hate having scores that don't end in 0 or 5.
Well, if you're going to be horrible people and do something like that, you could at least make it work properly.

It's not working for me, either. And I also had my account connected for RB2.

Same thing here. It took forever to be able to link, and it shows I'm linked and it tracks my progress etc, but no achievement. I've done all the trouble shooting but it just won't work. WTF??? I'm kinda frustrated because it's such a stupid thing to complain about, but here I am, complaining about a 6 point achievement....somebody just figure this out already....

Sorry for the double post- It literally just unlocked. When it says Press Start, I usually hit the green button. This time I pressed start, and there it is! Pretty lame if that was what the problem was....expecting rock stars to follow instructions...