{
"Clan Ban - Announce To Server": true,
"Clan Ban - Ban Type (Disabled = 0, EBS = 1, Vanilla = 2, DiscordMessages = 3)": 0,
"Clan Ban - Ban Type (Enabled = 0, EBS = 1, Vanilla = 2, DiscordMessages = 3)": 0
}

That is not a valid configuration; the valid, default configuration is:

{
  "Clan Ban - Ban Type (Disabled = 0, EBS = 1, Vanilla = 2, DiscordMessages = 3)": 0,
  "Clan Ban - Announce To Server": "True"
}​

The main thing you would change is that ending 0 to the type of ban type you want.

EBS (1) is the Enhanced Ban System plugin
DiscordMessages (3) is the Discord Messages plugin
Vanilla (2) is Rust's native ban system, not a plugin