Interaja com o MongoDB Atlas em uma função do AWS Lambda usando C#

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using MongoDB.Bson;
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using MongoDB.Driver;

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public class Function
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{
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    private static MongoClient? Client;
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    private static MongoClient CreateMongoClient()
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    {
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            var mongoClientSettings = MongoClientSettings.FromConnectionString(Environment.GetEnvironmentVariable("MONGODB_URI"));
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            return new MongoClient(mongoClientSettings);
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    }
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    static Function()
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    {
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        Client = CreateMongoClient();
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    }
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...
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}

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var mongoClientSettings = FromConnectionString("mongodb+srv://USER:PASSWORD@instancename.owdak.mongodb.net/?retryWrites=true&w=majority");

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public string FunctionHandler(string input, ILambdaContext context)
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{
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    if (Client != null)
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    {
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        try
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        {
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            var database = Client.GetDatabase("sample_airbnb");
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            var collection = database.GetCollection<BsonDocument>("listingsAndReviews");
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            var result = collection.Find(FilterDefinition<BsonDocument>.Empty).First();
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            return result.ToString();
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        }
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        catch
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        {
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            return "Handling failed";
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        }
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    } else
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    {
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        return "DB not initialized";
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    }
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}