None of the tome challenges "Kill the obsesion X times" work in 2vs8

Vult2

SUMMARY OF THE ISSUE: I tried 4-5 challenges of kill the obsesion 2 times, 3 times, 10 times, etc in 2vs8 and don't work. And the challenge of tome 18-2 Stop right there! don't seems work neither.

PLATFORM: PC

STEP BY STEP INSTRUCTIONS ON HOW THE ISSUE OCCURED:

VIDEO:

PLAYER LOGS:

• Player logs are required from PC players only.

Balrog

There is no obsession mechanic in 2v8.