У вашего броузера проблема в совместимости с HTML5
https://www.chaoscode.io/resources/raidnotice.87/
1. setup your server
2. invite users
3. register bot application for server https://discordapp.com/developers/applications/me
4. authorize your bot https://discordapp.com/oauth2/authorize?client_id=YOUT_BOT_CLIENT_ID&scope=bot&permissions=8
5. Auth bot with gateway.html provided
6. Save DiscordApi config and reload the plugin
7. User joined discord server can setup in-game his discord account by command /rn discord HisNickName#his_id
8. when get raided - get a message