Don't receive the challenge league rewards.

Hi I created a Necromancer SRS Character and did finish 4 challenges for the league rewards already. When I finished the 4th challenge i received a message that I reached the first milestone and am now able to equip the helmet attachment tier 1. The problem is if i look in my cosmetic stash the helmet attachment is not there. All other cosmetics, that i had bought already are there, but the reward is not there and when i look at the screen where you can see how many challenges you have already completed, it says that i unlocked the first reward and completed 4 challenges. Can you please help me get my reward? Thank you. I really like the league so far. Please continue to do the great work you do.

It worked, thank you very much and have a nice day.