diff --git a/infra/app/app-config/env-config/main.tf b/infra/app/app-config/env-config/main.tf
index a44cda83..a7263269 100644
--- a/infra/app/app-config/env-config/main.tf
+++ b/infra/app/app-config/env-config/main.tf
@@ -7,10 +7,4 @@ locals {
   prefix = terraform.workspace == "default" ? "" : "${terraform.workspace}-"
 
   bucket_name = "${local.prefix}${var.project_name}-${var.app_name}-${var.environment}"
-
-  network_config = module.project_config.network_configs[var.network_name]
-}
-
-module "project_config" {
-  source = "../../../project-config"
 }
diff --git a/infra/app/app-config/env-config/notifications.tf b/infra/app/app-config/env-config/notifications.tf
index 52464c23..b351c73e 100644
--- a/infra/app/app-config/env-config/notifications.tf
+++ b/infra/app/app-config/env-config/notifications.tf
@@ -1,6 +1,6 @@
 # Notifications configuration
 locals {
-  notifications_config = var.enable_notifications && var.domain_name != null && local.network_config.domain_config.hosted_zone != null ? {
+  notifications_config = var.enable_notifications ? {
     # Pinpoint app name.
     name = "${var.app_name}-${var.environment}"
 
diff --git a/infra/app/app-config/main.tf b/infra/app/app-config/main.tf
index ce4ba29c..4791259a 100644
--- a/infra/app/app-config/main.tf
+++ b/infra/app/app-config/main.tf
@@ -30,14 +30,7 @@ locals {
   # 3. Adds environment variables for the app client to the service
   enable_identity_provider = false
 
-  # Whether or not the application should deploy a notification service.
-  #
-  # To use this in a particular environment, domain_name must also be set.
-  # The domain name in set in infra/<APP_NAME>/app-config/<ENVIRONMENT>.tf
-  # The domain name the same domain as, of a subdomain of, the hosted zone in that environment.
-  # The hosted zone is set in infra/project-config/networks.tf
-  # If either (domain name or hosteed zone) is not set in an environment, notifications will not actually be enabled.
-  #
+  # Whether or not the application should deploy a notification service
   # If enabled:
   # 1. Creates an AWS Pinpoint application
   # 2. Configures email notifications using AWS SES
diff --git a/infra/app/service/identity_provider.tf b/infra/app/service/identity_provider.tf
deleted file mode 100644
index 13becda3..00000000
--- a/infra/app/service/identity_provider.tf
+++ /dev/null
@@ -1,58 +0,0 @@
-locals {
-  # If this is a temporary environment, re-use an existing Cognito user pool. Otherwise, create a new one.
-  identity_provider_user_pool_id = module.app_config.enable_identity_provider ? (
-    local.is_temporary ? module.existing_identity_provider[0].user_pool_id : module.identity_provider[0].user_pool_id
-  ) : null
-  identity_provider_environment_variables = module.app_config.enable_identity_provider ? {
-    COGNITO_USER_POOL_ID = local.identity_provider_user_pool_id,
-    COGNITO_CLIENT_ID    = module.identity_provider_client[0].client_id
-  } : {}
-}
-
-# If the app has `enable_identity_provider` set to true AND this is not a temporary
-# environment, then create a new identity provider.
-module "identity_provider" {
-  count  = module.app_config.enable_identity_provider && !local.is_temporary ? 1 : 0
-  source = "../../modules/identity-provider/resources"
-
-  is_temporary = local.is_temporary
-
-  name                             = local.identity_provider_config.identity_provider_name
-  password_minimum_length          = local.identity_provider_config.password_policy.password_minimum_length
-  temporary_password_validity_days = local.identity_provider_config.password_policy.temporary_password_validity_days
-  verification_email_message       = local.identity_provider_config.verification_email.verification_email_message
-  verification_email_subject       = local.identity_provider_config.verification_email.verification_email_subject
-  domain_name                      = local.network_config.domain_config.hosted_zone
-  sender_email                     = local.notifications_config == null ? null : local.notifications_config.sender_email
-  sender_display_name              = local.notifications_config == null ? null : local.notifications_config.sender_display_name
-  reply_to_email                   = local.notifications_config == null ? null : local.notifications_config.reply_to_email
-
-  # This module both explicitly requires the notifications module,
-  # because its `aws_sesv2_email_identity` resource to be imported.
-  depends_on = [
-    module.notifications,
-  ]
-}
-
-# If the app has `enable_identity_provider` set to true AND this *is* a temporary
-# environment, then use an existing identity provider.
-module "existing_identity_provider" {
-  count  = module.app_config.enable_identity_provider && local.is_temporary ? 1 : 0
-  source = "../../modules/identity-provider/data"
-
-  name = local.identity_provider_config.identity_provider_name
-}
-
-# If the app has `enable_identity_provider` set to true, create a new identity provider
-# client for the service. A new client is created for all environments, including
-# temporary environments.
-module "identity_provider_client" {
-  count  = module.app_config.enable_identity_provider ? 1 : 0
-  source = "../../modules/identity-provider-client/resources"
-
-  callback_urls = local.identity_provider_config.client.callback_urls
-  logout_urls   = local.identity_provider_config.client.logout_urls
-  name          = "${local.prefix}${local.identity_provider_config.identity_provider_name}"
-
-  user_pool_id = local.identity_provider_user_pool_id
-}
diff --git a/infra/app/service/main.tf b/infra/app/service/main.tf
index 74933c75..c3d220d4 100644
--- a/infra/app/service/main.tf
+++ b/infra/app/service/main.tf
@@ -50,6 +50,17 @@ locals {
   notifications_config                           = local.environment_config.notifications_config
 
   network_config = module.project_config.network_configs[local.environment_config.network_name]
+
+  # Identity provider locals.
+  # If this is a temporary environment, re-use an existing Cognito user pool.
+  # Otherwise, create a new one.
+  identity_provider_user_pool_id = module.app_config.enable_identity_provider ? (
+    local.is_temporary ? module.existing_identity_provider[0].user_pool_id : module.identity_provider[0].user_pool_id
+  ) : null
+  identity_provider_environment_variables = module.app_config.enable_identity_provider ? {
+    COGNITO_USER_POOL_ID = local.identity_provider_user_pool_id,
+    COGNITO_CLIENT_ID    = module.identity_provider_client[0].client_id
+  } : {}
 }
 
 terraform {
@@ -58,7 +69,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 5.81.0, < 6.0.0"
+      version = ">= 5.35.0, < 6.0.0"
     }
   }
 
@@ -214,3 +225,45 @@ module "storage" {
   name         = local.storage_config.bucket_name
   is_temporary = local.is_temporary
 }
+
+# If the app has `enable_identity_provider` set to true AND this is not a temporary
+# environment, then create a new identity provider.
+module "identity_provider" {
+  count  = module.app_config.enable_identity_provider && !local.is_temporary ? 1 : 0
+  source = "../../modules/identity-provider/resources"
+
+  is_temporary = local.is_temporary
+
+  name                             = local.identity_provider_config.identity_provider_name
+  password_minimum_length          = local.identity_provider_config.password_policy.password_minimum_length
+  temporary_password_validity_days = local.identity_provider_config.password_policy.temporary_password_validity_days
+  verification_email_message       = local.identity_provider_config.verification_email.verification_email_message
+  verification_email_subject       = local.identity_provider_config.verification_email.verification_email_subject
+
+  sender_email        = local.notifications_config == null ? null : local.notifications_config.sender_email
+  sender_display_name = local.notifications_config == null ? null : local.notifications_config.sender_display_name
+  reply_to_email      = local.notifications_config == null ? null : local.notifications_config.reply_to_email
+}
+
+# If the app has `enable_identity_provider` set to true AND this *is* a temporary
+# environment, then use an existing identity provider.
+module "existing_identity_provider" {
+  count  = module.app_config.enable_identity_provider && local.is_temporary ? 1 : 0
+  source = "../../modules/identity-provider/data"
+
+  name = local.identity_provider_config.identity_provider_name
+}
+
+# If the app has `enable_identity_provider` set to true, create a new identity provider
+# client for the service. A new client is created for all environments, including
+# temporary environments.
+module "identity_provider_client" {
+  count  = module.app_config.enable_identity_provider ? 1 : 0
+  source = "../../modules/identity-provider-client/resources"
+
+  callback_urls = local.identity_provider_config.client.callback_urls
+  logout_urls   = local.identity_provider_config.client.logout_urls
+  name          = "${local.prefix}${local.identity_provider_config.identity_provider_name}"
+
+  user_pool_id = local.identity_provider_user_pool_id
+}
diff --git a/infra/app/service/notifications.tf b/infra/app/service/notifications.tf
index 82aab8f5..423f5c3b 100644
--- a/infra/app/service/notifications.tf
+++ b/infra/app/service/notifications.tf
@@ -1,40 +1,40 @@
 locals {
   # If this is a temporary environment, re-use an existing email identity. Otherwise, create a new one.
-  domain_identity_arn = local.notifications_config != null ? (
+  domain_identity_arn = module.app_config.enable_notifications ? (
     !local.is_temporary ?
     module.notifications_email_domain[0].domain_identity_arn :
     module.existing_notifications_email_domain[0].domain_identity_arn
   ) : null
-  notifications_environment_variables = local.notifications_config != null ? {
+  notifications_environment_variables = module.app_config.enable_notifications ? {
     AWS_PINPOINT_APP_ID       = module.notifications[0].app_id,
     AWS_PINPOINT_SENDER_EMAIL = local.notifications_config.sender_email
   } : {}
-  notifications_app_name = local.notifications_config != null ? "${local.prefix}${local.notifications_config.name}" : ""
+  notifications_app_name = module.app_config.enable_notifications ? "${local.prefix}${local.notifications_config.name}" : ""
 }
 
 # If the app has `enable_notifications` set to true AND this is not a temporary
 # environment, then create a email notification identity.
 module "notifications_email_domain" {
-  count  = local.notifications_config != null && !local.is_temporary ? 1 : 0
+  count  = module.app_config.enable_notifications && !local.is_temporary ? 1 : 0
   source = "../../modules/notifications-email-domain/resources"
 
-  domain_name = local.network_config.domain_config.hosted_zone
+  domain_name = local.service_config.domain_name
 }
 
 # If the app has `enable_notifications` set to true AND this *is* a temporary
 # environment, then create a email notification identity.
 module "existing_notifications_email_domain" {
-  count  = local.notifications_config != null && local.is_temporary ? 1 : 0
+  count  = module.app_config.enable_notifications && local.is_temporary ? 1 : 0
   source = "../../modules/notifications-email-domain/data"
 
-  domain_name = local.network_config.domain_config.hosted_zone
+  domain_name = local.service_config.domain_name
 }
 
 # If the app has `enable_notifications` set to true, create a new email notification
 # AWS Pinpoint app for the service. A new app is created for all environments, including
 # temporary environments.
 module "notifications" {
-  count  = local.notifications_config != null ? 1 : 0
+  count  = module.app_config.enable_notifications ? 1 : 0
   source = "../../modules/notifications/resources"
 
   name                = local.notifications_app_name
diff --git a/infra/modules/identity-provider/resources/main.tf b/infra/modules/identity-provider/resources/main.tf
index 1cbb6c85..7787b000 100644
--- a/infra/modules/identity-provider/resources/main.tf
+++ b/infra/modules/identity-provider/resources/main.tf
@@ -4,14 +4,6 @@
 ## - Configures MFA
 ############################################################################################
 
-locals {
-  dash_domain = var.domain_name != null ? replace(var.domain_name, ".", "-") : null
-}
-
-data "aws_sesv2_email_identity" "main" {
-  email_identity = var.domain_name
-}
-
 resource "aws_cognito_user_pool" "main" {
   name = var.name
 
@@ -37,12 +29,11 @@ resource "aws_cognito_user_pool" "main" {
     # Use this SES email to send cognito emails. If we're not using SES for emails then use null.
     # Optionally configures the FROM address and the REPLY-TO address.
     # Optionally configures using the Cognito default email or using SES.
-    source_arn            = data.aws_sesv2_email_identity.main.arn
-    configuration_set     = local.dash_domain
-    email_sending_account = data.aws_sesv2_email_identity.main.arn != null ? "DEVELOPER" : "COGNITO_DEFAULT"
+    source_arn            = var.email_identity_arn
+    email_sending_account = var.email_identity_arn != null ? "DEVELOPER" : "COGNITO_DEFAULT"
     # Customize the name that users see in the "From" section of their inbox, so that it's clearer who the email is from.
     # This name also needs to be updated manually in the Cognito console for each environment's Advanced Security emails.
-    from_email_address     = data.aws_sesv2_email_identity.main.arn != null ? (var.sender_display_name != null ? "${var.sender_display_name} <${var.sender_email}>" : var.sender_email) : null
+    from_email_address     = var.email_identity_arn != null ? (var.sender_display_name != null ? "${var.sender_display_name} <${var.sender_email}>" : var.sender_email) : null
     reply_to_email_address = var.reply_to_email
   }
 
diff --git a/infra/modules/identity-provider/resources/variables.tf b/infra/modules/identity-provider/resources/variables.tf
index 659e8364..a8b54f21 100644
--- a/infra/modules/identity-provider/resources/variables.tf
+++ b/infra/modules/identity-provider/resources/variables.tf
@@ -1,6 +1,6 @@
-variable "domain_name" {
-  description = "The domain name to configure SES"
+variable "email_identity_arn" {
   type        = string
+  description = "The arn of the SESv2 email identity to use to send emails"
   default     = null
 }
 
diff --git a/infra/modules/notifications-email-domain/resources/main.tf b/infra/modules/notifications-email-domain/resources/main.tf
index f89cc8ce..318587c0 100644
--- a/infra/modules/notifications-email-domain/resources/main.tf
+++ b/infra/modules/notifications-email-domain/resources/main.tf
@@ -10,17 +10,16 @@ locals {
 # Verify email sender identity.
 # Docs: https://docs.aws.amazon.com/pinpoint/latest/userguide/channels-email-manage-verify.html
 resource "aws_sesv2_email_identity" "sender_domain" {
-  email_identity         = var.domain_name
+  email_identity         = local.dash_domain
   configuration_set_name = aws_sesv2_configuration_set.email.configuration_set_name
 }
 
 # The configuration set applied to messages that is sent through this email channel.
 resource "aws_sesv2_configuration_set" "email" {
-  configuration_set_name = local.dash_domain
+  configuration_set_name = var.domain_name
 
   delivery_options {
-    max_delivery_seconds = 300
-    tls_policy           = "REQUIRE"
+    tls_policy = "REQUIRE"
   }
 
   reputation_options {