What does it mean when a challenge ends with "In PvP"?

I have challenges like
“kill a spartan with disruptor/ heatwave In PvP”
Isn’t any game mode PvP?
I have killed multiple spartan across multiple game modes even the event, but i seem to make no progress on these challenges ending with “In PvP” can someone explain?

It means “not against bots”

I haven’t played a single game againts bots

The challenge itself is probably bugged.

pretty sure it means Ranked

No it doesn’t.

(20 character limit)

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I means any playlist other than bot bootcamp

In PVP means anything that isn’t the bot bootcamp or custom games. The heatwave challenge is specifically bugged, I think it is only tracking one of the heatwave’s alternate firing modes. My suggestion is to use a swap