Summary
Since matchmaking was moved over to Epic Online Services, if you just manually add a custom key into the matchmaking body, you will instantly start a custom game even if you don’t have a custom matchmaking code. This match also counts normally for stats.
Please select what you are reporting on:
Creative
What Type of Bug are you experiencing?
Matchmaking
Steps to Reproduce
Use a mitm proxy such as Fiddler and inject /Fortnite.com/Matchmaking:CustomKey":"" into the matchmaking body as an extra key pair.
Expected Result
You should get an error as you don’t have a Support-a-Creator code.
Observed Result
A game immediately starts which also counts for stats/challenges as if you were in a normal game.
Platform(s)
As long as the party leader is on Windows and using the exploit, any platforms can replicate.