It seems like 343i has a new problem With costume challenges I created 5 of them last night I put the time limit for 3 hours but the credits weren’t added to my account so I sign in to halowaypoint I check my custome challenges and notice of instead of saying 1st place it said completed can someone please tell me solution for this problem thank you. 
You have to “hand them in”; there should be a button somewhere (sorry haven’t used them in a while).
Did that iv been doing challnges since they came out it seems to be a big issue I have read a lot of threads Of this problem hope 343i does something about this 
Whats a “costume challenge”? Is it a challenge to make some real life halo armor in a certain amount of time?
> It seems like 343i has a new problem With costume challenges I created 5 of them last night I put the time limit for 3 hours but the credits weren’t added to my account so I sign in to halowaypoint I check my custome challenges and notice of instead of saying 1st place it said completed can someone please tell me solution for this problem thank you.
There is a issue with custom challenges at the moment, many players have the same problem as you. No word from 343i about it yet.
Here are 2 threads about the same issue.
http://halo.xbox.com/Forums/yaf_postst52091_Trouble-with-custom-challenges.aspx
http://halo.xbox.com/Forums/yaf_postst52083_question-about-custom-challenges-credits.aspx
thank you for the info for one moment i thought i was ban