diff --git a/policy_sentry/shared/iam_data.py b/policy_sentry/shared/iam_data.py
index 7a0ddc15..0676eaaa 100644
--- a/policy_sentry/shared/iam_data.py
+++ b/policy_sentry/shared/iam_data.py
@@ -45,8 +45,13 @@ def get_service_prefix_data(service_prefix: str) -> dict[str, Any]:
         List: A list of metadata about that service
     """
     try:
-        return cast("dict[str, Any]", iam_definition.get(service_prefix, {}))
+        return cast("dict[str, Any]", iam_definition[service_prefix])
     # pylint: disable=bare-except, inconsistent-return-statements
     except:
+        if service_prefix == "catalog":
+            # the resource types "Portfolio" and "Product" have the service name "catalog" in their ARN
+            # https://docs.aws.amazon.com/service-authorization/latest/reference/list_awsservicecatalog.html#awsservicecatalog-resources-for-iam-policies
+            return cast("dict[str, Any]", iam_definition["servicecatalog"])
+
         logger.info(f"Service prefix not {service_prefix} found.")
         return {}
diff --git a/policy_sentry/writing/sid_group.py b/policy_sentry/writing/sid_group.py
index 7c56e84e..ed078c37 100644
--- a/policy_sentry/writing/sid_group.py
+++ b/policy_sentry/writing/sid_group.py
@@ -320,6 +320,12 @@ def add_by_arn_and_access_level(
         """
         for arn in arn_list:
             service_prefix = get_service_from_arn(arn)
+            if "$" in service_prefix:
+                logger.debug(
+                    f"Not supported service {service_prefix} found in ARN {arn}"
+                )
+                continue
+
             service_action_data = get_action_data(service_prefix, "*")
             for service_prefix, action_data in service_action_data.items():
                 for row in action_data:
diff --git a/test/writing/test_sid_group_crud.py b/test/writing/test_sid_group_crud.py
index a6759b59..bf085fb8 100644
--- a/test/writing/test_sid_group_crud.py
+++ b/test/writing/test_sid_group_crud.py
@@ -297,6 +297,16 @@ def test_resource_restriction_plus_dependent_action_simple_2(self):
         # print(json.dumps(output, indent=4))
         self.assertDictEqual(output, desired_output)
 
+    def test_add_by_arn_and_access_level_ignores_placeholder_services(self):
+        # https://github.com/salesforce/policy_sentry/issues/448
+
+        sid_group = SidGroup()
+        sid_group.add_by_arn_and_access_level(
+            ["arn:${Partition}:${Vendor}:${Region}:*:${ResourceType}:${RecoveryPointId}"], "Read"
+        )
+
+        self.assertTrue(not sid_group.sids)
+
     def test_add_by_list_of_actions(self):
         actions_test_data_1 = ["kms:CreateCustomKeyStore", "kms:CreateGrant"]
         sid_group = SidGroup()