diff --git a/services/terraform/modules/shared/dynamodb.tf b/services/terraform/modules/shared/dynamodb.tf
--- a/services/terraform/modules/shared/dynamodb.tf
+++ b/services/terraform/modules/shared/dynamodb.tf
@@ -243,9 +243,11 @@
 }
 
 resource "aws_dynamodb_table" "identity-reserved-usernames" {
-  name         = "identity-reserved-usernames"
-  hash_key     = "username"
-  billing_mode = "PAY_PER_REQUEST"
+  name             = "identity-reserved-usernames"
+  hash_key         = "username"
+  billing_mode     = "PAY_PER_REQUEST"
+  stream_enabled   = true
+  stream_view_type = "NEW_AND_OLD_IMAGES"
 
   attribute {
     name = "username"
diff --git a/services/terraform/modules/shared/outputs.tf b/services/terraform/modules/shared/outputs.tf
--- a/services/terraform/modules/shared/outputs.tf
+++ b/services/terraform/modules/shared/outputs.tf
@@ -5,6 +5,7 @@
     aws_dynamodb_table.reports-service-reports,
     aws_dynamodb_table.tunnelbroker-undelivered-messages,
     aws_dynamodb_table.identity-users,
+    aws_dynamodb_table.identity-reserved-usernames,
   ]
 }
 
diff --git a/services/terraform/modules/shared/search_index_lambda.tf b/services/terraform/modules/shared/search_index_lambda.tf
--- a/services/terraform/modules/shared/search_index_lambda.tf
+++ b/services/terraform/modules/shared/search_index_lambda.tf
@@ -41,6 +41,12 @@
   starting_position = "LATEST"
 }
 
+resource "aws_lambda_event_source_mapping" "identity_reserved_usernames_trigger" {
+  event_source_arn  = aws_dynamodb_table.identity-reserved-usernames.stream_arn
+  function_name     = aws_lambda_function.search_index_lambda.arn
+  starting_position = "LATEST"
+}
+
 resource "aws_security_group" "search_index_lambda" {
   name   = "search_index_lambda_sg"
   vpc_id = var.vpc_id
diff --git a/services/terraform/remote/aws_iam.tf b/services/terraform/remote/aws_iam.tf
--- a/services/terraform/remote/aws_iam.tf
+++ b/services/terraform/remote/aws_iam.tf
@@ -231,9 +231,10 @@
       "dynamodb:ListStreams",
     ]
     resources = [
-      module.shared.dynamodb_tables["identity-users"].arn,
       module.shared.dynamodb_tables["identity-users"].stream_arn,
       "${module.shared.dynamodb_tables["identity-users"].arn}/stream/*",
+      module.shared.dynamodb_tables["identity-reserved-usernames"].stream_arn,
+      "${module.shared.dynamodb_tables["identity-reserved-usernames"].arn}/stream/*",
     ]
   }
 }