Halo Reach Challenges

theres a challenge today that ive seen a few times on daily challenges, where you have to link your gamertag to bungie website and its always worth 3000. Im already signed up to bungie.net and i dont know how to complete this chalenge, can anyone explain to me please??

If you are already on bungie.net I think you should get it by just starting an matchmaking game. I got the creds that way last time they had that as a challenge.

ive played loads of games already, rumblepit, teamslayer, a gruntpocalypse and it hasnt given it me

It must be glitched for you then when I got home I signed in and as soon as I started searching for a match in firefight it gave me the 3000, I didn't even have to start the match to get it. Checking online a few people seem to be having issues with that challenge when it comes up.