already did it from night 1
There's the 6/9/6/9 and 1/9/8/7 easter eggs. Maybe you have to actually complete 1/9/8/7 I don't remember.
the easter egg 1/9/8/7 has only a secret Call, but after checking the save data and tried something i found what went wrong, it was Freddy's death by power out, apparently it does not count if you die that way, though you get the easter egg anyway
if you beat 1987 you’ll see it’s not just the call
i beat 1987 and nothing happened except the phone call. 1987 mode is just the phone call
