I am new to rust and i try to remake a discord bot that i had made in python to help me learn some basics. I see in the serenity documentation that there is a event called when a user joins the server. I use the default_channel variable stored in the new_member with a match statement but it always return None and i can’t find why.

async fn guild_member_addition(&self, ctx: Context, new_member: Member) {
        //Get the default channel ID
        //let default_channel_id = 718229675473633341;
        match new_member.default_channel(&ctx.cache){
            Some(default_channel) => {
                println!("channel {:?}", default_channel);
            },
            None => {
                println!("Couldn't retrieve channel");
            }
        }
    }

I tried the bot in multiple servers, but none worked. I also doubled checked that the bot had all the necessary permissions.