Create a room, invite members from a different room, and send a message in the room we created

{
  "id": "83",
  "name": "Create a room, invite members from a different room, and send a message in the room we created",
  "nodes": [
    {
      "name": "On clicking 'execute'",
      "type": "n8n-nodes-base.manualTrigger",
      "position": [
        240,
        300
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "name": "Matrix",
      "type": "n8n-nodes-base.matrix",
      "position": [
        400,
        300
      ],
      "parameters": {
        "resource": "room",
        "roomName": "n8n",
        "roomAlias": "discussion-n8n"
      },
      "credentials": {
        "matrixApi": "matrix"
      },
      "typeVersion": 1
    },
    {
      "name": "IF",
      "type": "n8n-nodes-base.if",
      "position": [
        840,
        300
      ],
      "parameters": {
        "conditions": {
          "string": [
            {
              "value1": "={{$node[\"Matrix1\"].json[\"user_id\"]}}",
              "value2": "={{$node[\"Matrix2\"].json[\"user_...