can't unlock Apollyon

[Miranda ~]

I defeated Mega Satan for the first time right now but apollyon wasn't unlocked, i missed something or what?
I'm using external item descriptions btw

[Nazemec]

1:
List of things that prevent all kind of progress:
- Seeds (except a few special ones)
- Challenges (except for their reward obviously).
- Daily Runs.
- Reruns and Victory Laps (except for a few specific unlocks).
- Any active mod from the mod menu before Mom is killed once on that save (no matter what they do, other saves are irrelevant).
- Enabling the console before Mom is killed once on that save (even if you don't use it).
- Paranoid antivirus programs (or missing rights) preventing the game from creating/editing its save file.

2:
If you have the "always Void after Mega Satan" mod, disable it. It is known to interfere with Mega Satan-related unlocks.

[Miranda ~]

oh ok, i was in a Victory Lap, i didn't knew this could interfere, thank you for the answer, i'm going to try again another time, i hope you have a great week