singhmech:
What happened to the match play challenge games for credits? Only practice mode and scored modes show up. Notice you don't have challenge on skins either?
The person setting the game has to be on PC, not mobile, and even then I'm not sure mobile players can accept invites for Challenge matches.
The format definitely still exists for MP and Skins. I play on PC with other PC players and have played for credits in both formats in the last week.