diff --git a/ops-sunbeam/ops_sunbeam/charm.py b/ops-sunbeam/ops_sunbeam/charm.py
index d6827f9b..192258b2 100644
--- a/ops-sunbeam/ops_sunbeam/charm.py
+++ b/ops-sunbeam/ops_sunbeam/charm.py
@@ -636,6 +636,11 @@ class OSBaseOperatorCharmK8S(OSBaseOperatorCharm):
         super().__post_init__()
         self.pebble_handlers = self.get_pebble_handlers()
 
+    @property
+    def service_dns(self) -> str:
+        """Dns name for the service."""
+        return f"{self.app.name}.{self.model.name}.svc"
+
     def get_pebble_handlers(self) -> List[sunbeam_chandlers.PebbleHandler]:
         """Pebble handlers for the operator."""
         return [
@@ -1025,15 +1030,16 @@ class OSBaseOperatorAPICharm(OSBaseOperatorCharmK8S):
 
     @property
     def admin_url(self) -> str:
-        """Url for accessing the admin endpoint for this service."""
+        """Url for accessing the admin endpoint for this service.
+
+        Fallback to k8s resolvable hostname if no identity-service relation.
+        """
         binding = self.model.get_binding("identity-service")
         if binding and binding.network and binding.network.ingress_address:
             return self.add_explicit_port(
                 self.service_url(str(binding.network.ingress_address))
             )
-        raise sunbeam_guard.WaitingExceptionError(
-            "No admin address found for service"
-        )
+        return self.add_explicit_port(self.service_url(self.service_dns))
 
     @property
     def internal_url(self) -> str:
@@ -1052,9 +1058,7 @@ class OSBaseOperatorAPICharm(OSBaseOperatorCharmK8S):
             return self.add_explicit_port(
                 self.service_url(str(binding.network.ingress_address))
             )
-        raise sunbeam_guard.WaitingExceptionError(
-            "No internal address found for service"
-        )
+        return self.add_explicit_port(self.service_url(self.service_dns))
 
     def get_pebble_handlers(self) -> list[sunbeam_chandlers.PebbleHandler]:
         """Pebble handlers for the service."""
diff --git a/ops-sunbeam/ops_sunbeam/core.py b/ops-sunbeam/ops_sunbeam/core.py
index e2fb7b40..4017bfd0 100644
--- a/ops-sunbeam/ops_sunbeam/core.py
+++ b/ops-sunbeam/ops_sunbeam/core.py
@@ -25,9 +25,6 @@ from typing import (
 )
 
 import ops_sunbeam.tracing as sunbeam_tracing
-from ops_sunbeam.guard import (
-    BaseStatusExceptionError,
-)
 
 if TYPE_CHECKING:
     from ops_sunbeam.charm import (
@@ -104,20 +101,5 @@ class PostInitMeta(type):
     def __call__(cls, *args, **kw):
         """Call __post_init__ after __init__."""
         instance = super().__call__(*args, **kw)
-        try:
-            instance.__post_init__()
-        except BaseStatusExceptionError as e:
-            # Allow post init to raise an ops_sunbeam status
-            # exception without causing the charm to error.
-            # This status will be collected and set on the
-            # unit.
-            # import here to avoid circular import
-            from ops_sunbeam.charm import (
-                OSBaseOperatorCharm,
-            )
-
-            if isinstance(instance, OSBaseOperatorCharm):
-                instance.status.set(e.to_status())
-            else:
-                raise e
+        instance.__post_init__()
         return instance
diff --git a/ops-sunbeam/tests/unit_tests/test_core.py b/ops-sunbeam/tests/unit_tests/test_core.py
index ce42d8e8..9cb62cf5 100644
--- a/ops-sunbeam/tests/unit_tests/test_core.py
+++ b/ops-sunbeam/tests/unit_tests/test_core.py
@@ -484,6 +484,77 @@ class TestOSBaseOperatorAPICharm(_TestOSBaseOperatorAPICharm):
             "https://test.org:8443/something",
         )
 
+    def test_admin_url_id_svc(self):
+        """Test admin_url with service ID."""
+        test_utils.add_complete_identity_relation(self.harness)
+        self.assertEqual(
+            self.harness.charm.admin_url,
+            "http://10.0.0.10:789",
+        )
+
+    def test_admin_url_fallback_to_service_dns(self):
+        """Test admin_url fallback to service DNS."""
+        with patch.object(
+            self.harness.charm.model,
+            "get_binding",
+            MagicMock(return_value=None),
+        ):
+            self.assertEqual(
+                self.harness.charm.admin_url,
+                "http://my-service.test-model.svc:789",
+            )
+
+    def test_internal_url_ingress_internal(self):
+        """Test internal_url with internal ingress."""
+        test_utils.add_complete_ingress_relation(self.harness)
+        self.assertEqual(
+            self.harness.charm.internal_url,
+            "http://internal-url:80/",
+        )
+
+    def test_internal_url_fallback_to_id_svc(self):
+        """Test internal_url with service ID."""
+        test_utils.add_complete_identity_relation(self.harness)
+        self.assertEqual(
+            self.harness.charm.internal_url,
+            "http://10.0.0.10:789",
+        )
+
+    def test_internal_url_fallback_to_service_dns(self):
+        """Test internal fallback to service DNS."""
+        with patch.object(
+            self.harness.charm.model,
+            "get_binding",
+            MagicMock(return_value=None),
+        ):
+            self.assertEqual(
+                self.harness.charm.internal_url,
+                "http://my-service.test-model.svc:789",
+            )
+
+    def test_public_url_ingress_public(self):
+        """Test public_url with public ingress."""
+        test_utils.add_complete_ingress_relation(self.harness)
+        self.assertEqual(
+            self.harness.charm.public_url,
+            "http://public-url:80/",
+        )
+
+    def test_public_url_fallback_to_internal(self):
+        """Test public_url fallback to internal."""
+        self.assertEqual(
+            self.harness.charm.public_url,
+            self.harness.charm.internal_url,
+        )
+
+    def test_public_url_attribute_error(self):
+        """Test public_url with attribute error."""
+        del self.harness.charm.ingress_public
+        self.assertEqual(
+            self.harness.charm.public_url,
+            self.harness.charm.internal_url,
+        )
+
 
 class TestOSBaseOperatorMultiSVCAPICharm(_TestOSBaseOperatorAPICharm):
     """Test Charm with multiple services."""