I am facing the same problem. It shows the objective as completed ingame but it does not count wehn the game is finished. I also get a message after the game in the post mazch screen that there was a problem related to "server-validation".
What I already tried without any success:ä so far:
- - logged out of my account and logged in again
- - paused the evo and resumed it
- - paused the evo started a different evo with another player, paused that evo after the first objevtive and resumed the former evo
- - stopped scoring after having achieved exactly 2 assists (in game objevtive was not marked as completed; result: no error message but also objective not completed)
- - stopped scoring when the objective was shown as completed ingame (which is not after 2 assists but randonly after sometimes 3, sometimes 5 assists) result: error message in the post match screen and objevtive not completed
It is very(!) frustrating spending 100k coins on an evo and then having it bug out so I hope this will be fixed asap.