云sql实例无法选择地域

import tencentcloud.common.credentials
import tencentcloud.common.profile
import tencentcloud.cdb.v20170320.models
import tencentcloud.cdb.v20170320.cdb_client

# 设置凭证信息
cred = tencentcloud.common.credentials.Credentials("SecretId", "SecretKey")
clientProfile = tencentcloud.common.profile.ClientProfile()
clientProfile.endpoint = "cdb.tencentcloudapi.com"
client = tencentcloud.cdb.v20170320.cdb_client.CdbClient(cred, "ap-guangzhou", clientProfile)

# 创建实例请求
req = tencentcloud.cdb.v20170320.models.CreateDBInstanceRequest()
params = {
    "InstanceName": "test-instance",
    "DatabaseType": "mysql",
    "EngineVersion": "5.7",
    "Storage": 20,
    "InstanceClass": "db-1r2c2g",
    "Region": "ap-guangzhou"  # 选择地域
}
req.from_json_string(params)

# 发送请求
resp = client.CreateDBInstance(req)
print(resp.to_json_string(indent=2))