Two-way messages not working
Messages make it to Discord but not to the game from Discord.
{
  "FilterWords": [
    "badword1",
    "badword2"
  ],
  "FilteredWord": "<censored>",
  "LogExcludeGroups": [
    "default"
  ],
  "LogExcludePerms": [
    "example.permission"
  ],
  "Apikey": "XXXXXXXXXXXXXXXXXXXXXXXXXXXX",
  "AutoReloadPlugin": true,
  "AutoReloadTime": 501,
  "LogChat": true,
  "LogJoinQuits": false,
  "LogDeaths": false,
  "LogVehicleSpawns": false,
  "LogCrateDrops": false,
  "LogUserGroups": false,
  "LogPermissions": false,
  "LogKickBans": false,
  "LogNameChanges": false,
  "LogServerCommands": false,
  "LogServerMessages": false,
  "LogF7Reports": false,
  "LogTeams": false,
  "LogClans": false,
  "LogMutes": false,
  "LogPMs": false,
  "LogSignArtist": false,
  "LogDiscordAuth": true,
  "ReportCommand": "report",
  "Commandprefix": null,
  "Channels": [{
    "Channelid": "XXXXXXXXXXXXXXX",
    "perms": [
      "msg_chat",
      "msg_serverinit"
    ]
  }],
  "Commandroles": {
    "command": [
      "rolename1",
      "rolename2"
    ]
  }
}​
Also see this in the log when trying to send a message from discord

Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)

at Oxide.Plugins.Rustcord.Discord_MessageCreate_Ex (Oxide.Ext.Discord.DiscordObjects.Message

I am having the same issue.  It use to work with no issues but now messages from Discord to game are not working.
check if !commands in discord also dont work, if so the extension timed out, reload plugin.
Still not working. See full error from console when sending from Discord

Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)

at Oxide.Plugins.Rustcord.Discord_MessageCreate_Ex (Oxide.Ext.Discord.DiscordObjects.Message message) [0x0008f] in <c7fec408168349c2a8ef3afe1bf5da37>:0

at Oxide.Plugins.Rustcord+<Discord_MessageCreate>c__AnonStorey4.<>m__0 () [0x00000] in <c7fec408168349c2a8ef3afe1bf5da37>:0

at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <ac41dd3599754d448b8c218b34645820>:0

5b7b09575e872.jpg?uid=5b7b096ae264e OuTSMoKE
check if !commands in discord also dont work, if so the extension timed out, reload plugin.
I think you might be right on that.  I checked it and one of my servers it was working.  I will have to test it to see of the other servers are working correctly now.
Still the same thing. Reloaded mod, got new token, etc. Thoughts?
No idea then. There will be a new version soon with a bunch of recoding, when that drops let me know if it works.