Terraform apply error 'The number of path segments is not divisible by 2' for Azure App Feature Flag - azure-devops

Question

Terraform apply error 'The number of path segments is not divisible by 2' for Azure App Feature Flag
Why am I seeing this error? Hard to find any answer to this anywhere. I am using Terraform v2.93.0
and I also tried 2.90.0 and 2.56.0, and got the same problem. I was adding configs just fine but
as soon as I tried to configure a Feature Flag, it breaks the Terraform project AND
I am forced to rebuild re-init from scratch. Terraform is not able to recover on its own if I remove the config and running plan again.
╷
│ Error: while parsing resource ID: while parsing resource ID:
| The number of path segments is not divisible by 2 in
| "subscriptions/{key}/resourceGroups/my-config-test/providers/Microsoft.AppConfiguration/configurationStores/my-app-configuration/AppConfigurationFeature/.appconfig.featureflag/DEBUG/Label/my-functions-test"
│
│ while parsing resource ID: while parsing resource ID:
| The number of path segments is not divisible by 2 in
│ "subscriptions/{key}/resourceGroups/my-config-test/providers/Microsoft.AppConfiguration/configurationStores/my-app-configuration/AppConfigurationFeature/.appconfig.featureflag/DEBUG/Label/my-functions-test"
╵
╷
│ Error: obtaining auth token for "https://my-app-configuration.azconfig.io": getting authorization token for endpoint https://my-app-configuration.azconfig.io:
| obtaining Authorization Token from the Azure CLI: parsing json result from the Azure CLI: waiting for the Azure CLI: exit status 1: ERROR: The command failed with an unexpected error. Here is the traceback:
│ ERROR: [Errno 2] No such file or directory
WHY is the slash missing from the front of the ID????
And here is the config that breaks it:
resource "azurerm_app_configuration_feature" "my_functions_test_DEBUG" {
configuration_store_id = azurerm_app_configuration.my_app_configuration.id
description = "Debug Flag"
name = "DEBUG"
label = "my-functions-test"
enabled = false
}
When it is healthy, the apply on configs works, and looks like this:
Plan: 4 to add, 0 to change, 0 to destroy.
Do you want to perform these actions in workspace "my-app-config-test"?
Terraform will perform the actions described above.
Only 'yes' will be accepted to approve.
Enter a value: yes
azurerm_resource_group.my_config_rg_test: Creating...
azurerm_resource_group.my_config_rg_test: Creation complete after 0s [id=/subscriptions/{key}/resourceGroups/my-config-test]

Answer 1

Ok, I figured it out. There is a bug: when create a azurerm_app_configuration_key resource, the key can be like so key = "/application/config.EXSTREAM_DOMAIN" BUT when you create a azurerm_app_configuration_feature, you will HOSE your terraform config if you try to set the name field to name = .appconfig.featureflag/DEBUG. Instead, just set the name field to DEBUG. If you don't do that, you have to completely reset your terraform and re-initialize all the resources. Had to learn the hard way. There error message was not helpful but could be updated to be helpful in this respect.