Did you have a lot of mail was your mail full? What tier did you get to? And what did you place in the campaign? Best best is to report it and put a ticket in had a friend his mail was full and he didn't get his rewards when the campaign ended.
I'm ps4 EU the main 30 day CP campaign ended a couple of days ago and I didn't get any rewards for any of my characters, as in at the end of campaign you get mail with some gear, 50 transmutation crystals and gold. I spent loads of time in cyro as well.
Why?!