[Missing riven mod]

Hi people I need help with a problem... Days ago I did an incursion mission and I win a melé riven mod.. I put on my war to try open and go out of the game (I'm not open the mod) I don't play for this week and know my riven mod not are in my inventory! No on my war or any place I found in all mod but nos is in anywhere!! Please you can help my???