How to fix Error: Error deleting Network Security Group: InUseNetworkSecurityGroupCannotBeDeleted in Terraform

az network nsg show --name my-nsg --resource-group my-rg

# Remove or comment out:
resource "azurerm_subnet_network_security_group_association" "example" {
  subnet_id                 = azurerm_subnet.example.id
  network_security_group_id = azurerm_network_security_group.example.id
}

terraform apply

# Remove or comment out:
resource "azurerm_network_interface_security_group_association" "example" {
  network_interface_id      = azurerm_network_interface.example.id
  network_security_group_id = azurerm_network_security_group.example.id
}

terraform apply

terraform destroy -target=azurerm_network_interface.example
terraform destroy

resource "azurerm_network_security_group" "example" {
  # ... config ...
}

resource "azurerm_network_interface" "example" {
  # ... config ...
  depends_on = [azurerm_network_security_group.example]
}

# DON'T DO THIS - will cause conflicts:
resource "azurerm_network_security_group" "example" {
  security_rule {
    name = "AllowHTTP"
    # ...
  }
}

resource "azurerm_network_security_rule" "example" {
  name = "AllowHTTPS"
  # ...
}

terraform destroy

terraform refresh
terraform destroy