If the plugin is just tagging and missing the rest of the calls body, it means your webhooks don't have the "/slack" at the end of them. You shouldn't remove that part when setting your own webhook URL.
You need it to be like this:
Code:
"calladmin"
{
"url" "https://discordapp.com/api/webhooks/xxxxxxxxxxxxxxxx/slack"
}
Just add "/slack" to the end of your webhook URLs in discord.cfg and that'll fix it for ya.