如何在go（lang）中连接到mlab mongodb数据库？

I have a mlab MongoDB database called storyfactory. This database has a collection called test, which has a user called Standard with a Password.

I'm trying to connect to the database with this Driver.
This is the code:

package main

import (
    "context"
    "fmt"
    "log"
    "time"

    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
)

func main() {
    ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
    client, err := mongo.Connect(ctx, options.Client().ApplyURI("mongodb://<Standard>:<Password>@ds127101.mlab.com:27101/storyfactory"))
    if err != nil {
        log.Fatal(err)
    }
    collection := client.Database("storyfactory").Collection("test")
    ctx, _ = context.WithTimeout(context.Background(), 5*time.Second)
    res, err := collection.InsertOne(ctx, bson.M{"name": "pi", "value": 3.14159})
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(res.InsertedID)
}

If I try to run this code, I get following output:

2019/03/12 18:09:04 auth error: sasl conversation error: unable to authenticate using mechanism "SCRAM-SHA-1": (AuthenticationFailed) Authentication failed.
exit status 1

I'm 100% sure that the Password is correct.
Thanks for your help!