diff --git a/oslo_limit/limit.py b/oslo_limit/limit.py
index 6c26162..793793c 100644
--- a/oslo_limit/limit.py
+++ b/oslo_limit/limit.py
@@ -305,6 +305,7 @@ class _EnforcerUtils:
         try:
             services = self.connection.services(type=service_type,
                                                 name=service_name)
+            services = list(services)
             if len(services) > 1:
                 raise ValueError("Multiple services found")
             service_id = services[0].id
@@ -315,6 +316,7 @@ class _EnforcerUtils:
             try:
                 regions = self.connection.regions(
                     name=CONF.oslo_limit.endpoint_region_name)
+                regions = list(regions)
                 if len(regions) > 1:
                     raise ValueError("Multiple regions found")
                 region_id = regions[0].id
@@ -328,6 +330,7 @@ class _EnforcerUtils:
                 service_id=service_id, region_id=region_id,
                 interface=CONF.oslo_limit.endpoint_interface,
             )
+            endpoints = list(endpoints)
         except os_exceptions.ResourceNotFound:
             raise ValueError("Endpoint not found")
 
diff --git a/oslo_limit/opts.py b/oslo_limit/opts.py
index 9dd034a..a09cd0b 100644
--- a/oslo_limit/opts.py
+++ b/oslo_limit/opts.py
@@ -39,9 +39,8 @@ _options = [
         help=_("Region to which the endpoint belongs")),
     cfg.StrOpt(
         'endpoint_interface',
-        default='publicURL',
-        choices=['public', 'publicURL', 'internal', 'internalURL',
-                 'admin', 'adminURL'],
+        default='public',
+        choices=['public', 'internal', 'admin'],
         help=_("The interface for endpoint discovery")),
 ]
 
diff --git a/oslo_limit/tests/test_limit.py b/oslo_limit/tests/test_limit.py
index 5882b97..9ec6a75 100644
--- a/oslo_limit/tests/test_limit.py
+++ b/oslo_limit/tests/test_limit.py
@@ -437,7 +437,7 @@ class TestEnforcerUtils(base.BaseTestCase):
         self.mock_conn.services.assert_called_once_with(type='SERVICE_TYPE',
                                                         name='SERVICE_NAME')
         self.mock_conn.endpoints.assert_called_once_with(
-            service_id='SERVICE_ID', region_id=None, interface='publicURL')
+            service_id='SERVICE_ID', region_id=None, interface='public')
 
     def test_get_endpoint_lookup_multiple_endpoints(self):
         self.config_fixture.config(group='oslo_limit', endpoint_id=None)
@@ -462,7 +462,7 @@ class TestEnforcerUtils(base.BaseTestCase):
         self.mock_conn.services.assert_called_once_with(type='SERVICE_TYPE',
                                                         name='SERVICE_NAME')
         self.mock_conn.endpoints.assert_called_once_with(
-            service_id='SERVICE_ID', region_id=None, interface='publicURL')
+            service_id='SERVICE_ID', region_id=None, interface='public')
 
     def test_get_endpoint_lookup_endpoint_not_found(self):
         self.config_fixture.config(group='oslo_limit', endpoint_id=None)
@@ -485,7 +485,7 @@ class TestEnforcerUtils(base.BaseTestCase):
         self.mock_conn.services.assert_called_once_with(type='SERVICE_TYPE',
                                                         name='SERVICE_NAME')
         self.mock_conn.endpoints.assert_called_once_with(
-            service_id='SERVICE_ID', region_id=None, interface='publicURL')
+            service_id='SERVICE_ID', region_id=None, interface='public')
 
     def test_get_endpoint_lookup_multiple_service(self):
         self.config_fixture.config(group='oslo_limit', endpoint_id=None)
@@ -557,7 +557,7 @@ class TestEnforcerUtils(base.BaseTestCase):
         self.mock_conn.regions.assert_called_once_with(name='regionOne')
         self.mock_conn.endpoints.assert_called_once_with(
             service_id='SERVICE_ID', region_id='REGION_ID',
-            interface='publicURL')
+            interface='public')
 
     def test_get_endpoint_lookup_with_region_not_found(self):
         self.config_fixture.config(group='oslo_limit', endpoint_id=None)
diff --git a/releasenotes/notes/bug-2123895-d46347955768fab1.yaml b/releasenotes/notes/bug-2123895-d46347955768fab1.yaml
new file mode 100644
index 0000000..039d8e0
--- /dev/null
+++ b/releasenotes/notes/bug-2123895-d46347955768fab1.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    `bug 2123895` <https://bugs.launchpad.net/oslo.limit/+bug/2123895>`_:
+    Fixed the capability to query endpoint id from Keystone, which consistently
+    failed due to internal TypeError.