无效的数据库实例类：db.t2.micro

为什么我不能db.t2.micro在 CloudFormation 中创建大小数据库？这是我的模板：

Resources:
  Database:
    Type: AWS::RDS::DBInstance
    Properties: 
      AllocatedStorage: 20
      AllowMajorVersionUpgrade: No
      BackupRetentionPeriod: 7
      DBInstanceClass: db.t2.micro
      DBName: myDB
      DeletionProtection: no
      Engine: mysql
      MasterUsername: admin
      MasterUserPassword: superSecret
      MultiAZ: no
      PubliclyAccessible: yes
      VPCSecurityGroups:
        - !Ref SG

我得到的错误是：

Invalid DB Instance class: db.t2.micro (Service: AmazonRDS; Status Code: 400; Error Code: InvalidParameterValue; Request ID: ????; Proxy: null)

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回答

aws rds describe-orderable-db-instance-options --engine mysql --db-instance-class db.t2.micro --region eu-north-1

{
    "OrderableDBInstanceOptions": []
}