无法将数据添加到MongoDB Atlas“未授权执行命令{插入：…}”

我可以使用StringURI连接到MongoDB，BUT如果我尝试添加架构，则会得到错误消息：

MongoDB Connected ..
{ MongoError: not authorized on admin to execute command { insert: "animals", documents: [[{isEndangered true} {dateOfEntry 2019-10-03 22:33:54.852 +0000 UTC} {_id ObjectIdHex("5d967752e762ed56dc4f1dba")} {name Red Panda} {__v 0}]], ordered: true, writeConcern: { w: "majority" }, lsid: { id: {4 [194 242 186 89 84 47 69 212 143 253 85 42 86 82 70 95]} }, txnNumber: 1.000000, $clusterTime: { clusterTime: 6743708686104920070, signature: { hash: [247 92 77 50 
194 115 41 36 114 64 156 130 20 135 223 112 71 207 137 248], keyId: 6728180188896559104.000000 } }, $db: "admin" }
    at Connection.<anonymous> (C:\Users\xxxx\Documents\04_Programmering\mongoDB_Node\node_modules\mongodb\lib\core\connection\pool.js:466:61)
    at Connection.emit (events.js:197:13)
    at processMessage (C:\Users\xxxx\Documents\04_Programmering\mongoDB_Node\node_modules\mongodb\lib\core\connection\connection.js:364:10)
    at TLSSocket.<anonymous> (C:\Users\xxxx\Documents\04_Programmering\mongoDB_Node\node_modules\mongodb\lib\core\connection\connection.js:533:15)
    at TLSSocket.emit (events.js:197:13)
    at addChunk (_stream_readable.js:288:12)
    at readableAddChunk (_stream_readable.js:269:11)
    at TLSSocket.Readable.push (_stream_readable.js:224:10)
    at TLSWrap.onStreamRead [as onread] (internal/stream_base_commons.js:150:17)
  ok: 0,
  errmsg:
   'not authorized on admin to execute command { insert: "animals", documents: [[{isEndangered true} {dateOfEntry 2019-10-03 22:33:54.852 +0000 UTC} {_id ObjectIdHex("5d967752e762ed56dc4f1dba")} {name Red Panda} {__v 0}]], ordered: true, writeConcern: { w: "majority" }, lsid: { id: {4 [194 242 186 89 84 47 69 212 143 253 85 42 86 82 70 95]} }, txnNumber: 1.000000, $clusterTime: { clusterTime: 6743708686104920070, signature: { hash: [247 92 77 50 194 115 41 36 114 64 156 130 20 135 223 112 71 207 137 248], keyId: 6728180188896559104.000000 } }, $db: "admin" }',
  code: 8000,
  codeName: 'AtlasError',
  name: 'MongoError',
  [Symbol(mongoErrorContextSymbol)]: {} }

我的连接字符串：（使用软件包“ config”，没有问题[尝试无]）

{
    "mongoURI": "mongodb+srv://xxxx:[email protected]/admin?retryWrites=true&w=majority"
}

使用Mongoose驱动程序和连接：

mongoose
    .connect(db, { useNewUrlParser: true, useCreateIndex: true, useFindAndModify: false, useUnifiedTopology: true})
    .then(() => console.log('MongoDB Connected ..'))
    .catch(err => console.log(err));

我已经尝试过：

• 将我当前的IP和网络访问中的0.0.0.0/0列入白名单
• 具有两个角色的授权（均为AtlasAdmin和具有正确用户名和密码的ReadWrite用户）
• 使用连接字符串：mongodb + srv：//：@ xxxx-xxxxx.mongodb / admin？retryWrites = true＆w = majority
• 我知道Atlas的局限性，但我试图像这样简单地添加表格：

const newAnimal = new Animal({
    name: 'Red Panda',
    isEndangered: true
});

newAnimal
    .save()
    .then(item => console.log(item))
    .catch(err => console.log(err));

这是新功能，我甚至不想在开始之前就退出。免费的Atlas帐户对于较小的演示和学习来说似乎是个不错的开始，无需处理连接和Schema等问题。

错误在说：