Killing Sirius but dont count in challenges

I am play just on Pherecia i havent character on Keepers and i am play RF pala

I have problem with killing Sirius , because after i kill him, his kill dont count to Pinnacle bosses in 40 , Grueling Game Grinds and Sirus, Awakener of Worlds in Eye of the Storm dont count in challenge 39. Oppressive Opponents

I am try relog kill him in my hidout in friend hideout , killing him in party without party but still not count i am just wasting currency for entry and time so i am just really ask you for help please , thanks a lot for your time and help and patient .

The uber version is required for the 39 challenge. I assume you are doing that, since you've completed some of the others at uber level? Shouldn't mater for 40 anyway, I'm not sure why that wouldn't be counting. What bosses have you run to get the other 15/75? It's stuck on 15 while you are beating Sirus? That's what it is showing when I look on your profile.

Hopefully someone can advise, I haven't done challenges this league myself.