Won 7 games of Total Mayhem yesterday for the weekly challenge which unlocked fine, but Partygoer lifetime challenge is showing 0 wins in arcade games.
Quick update, just won another game in arcade to check on this and it has changed to 1 win.
Another update, looks like it’s only affecting Total Mayhem, just won 2 more games and got no progress towards the challenge.
I was about to post this. I think this is most likely due to the “Excludes Total Mayhem and co-op modes” seen in some of the Daily and Weekly challenges.
It’s a bummer because that’s the only Arcade mode I like to play and, despite winning several matches, my progress is still at 0.
Just today, I have 4 victories, and my progress is still at 0. I would post screenshots as proof but I’m unable to.
I think this worked before they took it out to fix zarya when they kept us waiting for 15-16 days off no mayhem
But please Blizzard fix this so I can get Partygoer by playing Total mayhem!
Would be epic if u could nerf moira fade, winston bubble, lucio boop, mercy revive and maybe take up cooldown on javelin spin or purtification on orisa aswell 
Edit: Overwatch 2’s first Halloween event will start on October 25, 2022 and end on November 8, 2022. This will be a free limited-time event that all Overwatch 2 players can participate in.
oh so Halloween event was much later when they removed to fix Zarya, so maybe it was from start? either way I see no reason why lifetime challenge should not work in Total Mayhem… Weeklies and dailies I understand though.