Ensure that the attribute 'permissive_output_firewall_rules' in Defender for IoT is not set to false

Allowing overly permissive outbound traffic could lead to unauthorized access to the IoT Hub.

In Azure Console -

1. Go to Azure IoT Hub.
2. Choose a IoT Hub to edit.
3. In the Defender for IoT, Choose Settings.
4. Click on the Recommendation Configuration and choose the Permissive output firewall rules recommendation.
5. Click Enable.

In Terraform -

1. In the azurerm_iot_security_solution resource, set recommendations_enabled.permissive_output_firewall_rules to true.

References:
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/iot_security_solution#permissive_output_firewall_rules