azurerm_servicebus_subscription: default_message_ttl not being set

[jadamsowers]

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Terraform Version

Terraform v0.11.7
+ provider.azurerm v1.6.0

Affected Resource(s)

• azurerm_servicebus_subscription

Terraform Configuration Files

resource "azurerm_servicebus_subscription" "dev-test-session-state-change-test-code-generated" {
  name                = "test-code-generated"
  resource_group_name = "${azurerm_resource_group.servicebus.name}"
  namespace_name      = "${azurerm_servicebus_namespace.servicebus.name}"
  topic_name          = "${azurerm_servicebus_topic.dev_test_session_state_change.name}"
  max_delivery_count  = 1
  default_message_ttl = "PT1H"
}

(Incidentally I got the PT1H value from setting TTL manually in the portal to 1 hour and copying the output from a terraform plan value afterward)

Expected Behavior

default_message_ttl set to 1 hour

Actual Behavior

default_message_ttl set to a ridiculously large number of days

Steps to Reproduce

1. terraform apply

Terraform will perform the following actions:

~ azurerm_servicebus_subscription.dev-test-session-state-change-test-code-generated
default_message_ttl: "P10675199DT2H48M5.4775807S" => "PT1H"

<snip>

azurerm_servicebus_subscription.test-session-state-change-test-code-generated: Modifying... (ID: >/subscriptions/99ad76ef-6657-4056-b87f-...ange/subscriptions/test-code-generated)
default_message_ttl: "P10675199DT2H48M5.4775807S" => "PT1H"

Which looks great. However if I run terraform apply again or view the subscription in the portal, it's still set to a ludicrously high value.

Important Factoids

Note that I'm setting the same PT1H value in a servicebus topic and it's being set correctly to 1 hour.

[ghost]

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