Squad deathmatch challenge 1 cant be completed

Hello. 

I've started to complete this challenge before patch which lowered requirements has arrived. When it arrived, I' ve recieved message that I've cmpleted the challenge. But problem is, I'm recieveing this message each match. And I can't choose support character which should be opened for this challenge since it says "complete squad death match challenge 1". But on the page with this challenge it is markled as completed. So... I don't know what to do.