diff --git a/CHANGELOG/CHANGELOG-1.21.md b/CHANGELOG/CHANGELOG-1.21.md
index eb6a04ae1..0f96f253e 100644
--- a/CHANGELOG/CHANGELOG-1.21.md
+++ b/CHANGELOG/CHANGELOG-1.21.md
@@ -24,3 +24,4 @@ When cutting a new release, update the `unreleased` heading to the tag being gen
 * [BUGFIX] [#1460](https://github.com/k8ssandra/k8ssandra-operator/issues/1460) Fix podName calculations in medusa's hostmap.go to account for unbalanced racks also
 * [BUGFIX] [#1466](https://github.com/k8ssandra/k8ssandra-operator/issues/1466) Do not overwrite existing status fields or forget to write the changes. Also, add new ContextName for the Datacenter to know where it used to be. 
 * [ENHANCEMENT] [#1455](https://github.com/k8ssandra/k8ssandra-operator/issues/1455) Expose configuration of Medusa's gRPC server port
+* [BUGFIX] [#1471](https://github.com/k8ssandra/k8ssandra-operator/issues/1471) Use namespaced service name when registering k8ssandra cluster to Reaper
diff --git a/pkg/reaper/manager.go b/pkg/reaper/manager.go
index d8287b0fb..d5d9a99c3 100644
--- a/pkg/reaper/manager.go
+++ b/pkg/reaper/manager.go
@@ -68,7 +68,8 @@ func (r *restReaperManager) connect(ctx context.Context, reaperSvc, username, pa
 }
 
 func (r *restReaperManager) AddClusterToReaper(ctx context.Context, cassdc *cassdcapi.CassandraDatacenter) error {
-	return r.reaperClient.AddCluster(ctx, cassdcapi.CleanupForKubernetes(cassdc.Spec.ClusterName), cassdc.GetSeedServiceName())
+	namespacedServiceName := cassdc.GetSeedServiceName() + "." + cassdc.Namespace
+	return r.reaperClient.AddCluster(ctx, cassdcapi.CleanupForKubernetes(cassdc.Spec.ClusterName), namespacedServiceName)
 }
 
 func (r *restReaperManager) VerifyClusterIsConfigured(ctx context.Context, cassdc *cassdcapi.CassandraDatacenter) (bool, error) {
diff --git a/test/e2e/cluster_scope_test.go b/test/e2e/cluster_scope_test.go
index 7cdd913e2..e39c9b841 100644
--- a/test/e2e/cluster_scope_test.go
+++ b/test/e2e/cluster_scope_test.go
@@ -15,6 +15,7 @@ func multiDcMultiCluster(t *testing.T, ctx context.Context, klusterNamespace str
 
 	dc1Namespace := "test-1"
 	dc2Namespace := "test-2"
+	reaperNamespace := "test-0"
 
 	t.Log("check that the K8ssandraCluster was created")
 	k8ssandra := &api.K8ssandraCluster{}
@@ -84,4 +85,24 @@ func multiDcMultiCluster(t *testing.T, ctx context.Context, klusterNamespace str
 	t.Log("check nodes in dc2 see nodes in dc1")
 	pod = DcPrefix(t, f, dc2Key) + "-rack1-sts-0"
 	checkNodeToolStatus(t, f, f.DataPlaneContexts[1], dc2Namespace, pod, count, 0, "-u", username, "-pw", password)
+
+	t.Log("check that cluster was registered in Reaper")
+	reaperKey := framework.ClusterKey{K8sContext: f.ControlPlaneContext, NamespacedName: types.NamespacedName{Namespace: reaperNamespace, Name: "reaper1"}}
+	dcKey := framework.ClusterKey{K8sContext: f.DataPlaneContexts[0], NamespacedName: types.NamespacedName{Namespace: dc1Namespace, Name: "dc1"}}
+	dcPrefix := DcPrefix(t, f, dcKey)
+	checkReaperReady(t, f, ctx, reaperKey)
+	createKeyspaceAndTable(t, f, ctx, f.DataPlaneContexts[0], dc1Namespace, k8ssandra.Name, dcPrefix+"-rack1-sts-0", "test_ks", "test_table", 2)
+
+	t.Log("deploying Reaper ingress routes in context", f.ControlPlaneContext)
+	reaperRestHostAndPort := ingressConfigs[f.ControlPlaneContext].ReaperRest
+	f.DeployReaperIngresses(t, f.ControlPlaneContext, k8ssandra.Namespace, "reaper1-service", reaperRestHostAndPort)
+	defer f.UndeployAllIngresses(t, f.ControlPlaneContext, k8ssandra.Namespace)
+	checkReaperApiReachable(t, ctx, reaperRestHostAndPort)
+
+	t.Run("TestReaperApi[0]", func(t *testing.T) {
+		t.Log("test Reaper API in context", f.ControlPlaneContext)
+		secretKey := framework.ClusterKey{K8sContext: f.ControlPlaneContext, NamespacedName: types.NamespacedName{Namespace: k8ssandra.Namespace, Name: "reaper-ui-secret"}}
+		username, password := retrieveCredentials(t, f, ctx, secretKey)
+		testReaperApi(t, ctx, f.ControlPlaneContext, DcClusterName(t, f, dcKey), "test_ks", username, password)
+	})
 }
diff --git a/test/testdata/fixtures/multi-dc-cluster-scope/k8ssandra.yaml b/test/testdata/fixtures/multi-dc-cluster-scope/k8ssandra.yaml
index f4d545db9..4daeb08c5 100644
--- a/test/testdata/fixtures/multi-dc-cluster-scope/k8ssandra.yaml
+++ b/test/testdata/fixtures/multi-dc-cluster-scope/k8ssandra.yaml
@@ -37,6 +37,7 @@ spec:
         concurrent_writes: 2
         concurrent_counter_writes: 2
       jvmOptions:
+        cassandra_ring_delay_ms: 0
         heapSize: 512Mi
         heapNewGenSize: 256Mi
         gc: CMS
@@ -69,3 +70,9 @@ spec:
             nodeAffinityLabels:
               "topology.kubernetes.io/zone": region2-zone2
     mgmtAPIHeap: 64Mi
+  reaper:
+    reaperRef:
+      name: reaper1
+      namespace: test-0
+    uiUserSecretRef:
+      name: reaper-ui-secret
diff --git a/test/testdata/fixtures/multi-dc-cluster-scope/kustomization.yaml b/test/testdata/fixtures/multi-dc-cluster-scope/kustomization.yaml
index 03cca31b9..c38d6b1da 100644
--- a/test/testdata/fixtures/multi-dc-cluster-scope/kustomization.yaml
+++ b/test/testdata/fixtures/multi-dc-cluster-scope/kustomization.yaml
@@ -2,4 +2,5 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
   - medusa-config.yaml
+  - reaper.yaml
   - k8ssandra.yaml
diff --git a/test/testdata/fixtures/multi-dc-cluster-scope/reaper.yaml b/test/testdata/fixtures/multi-dc-cluster-scope/reaper.yaml
new file mode 100644
index 000000000..e97d664e9
--- /dev/null
+++ b/test/testdata/fixtures/multi-dc-cluster-scope/reaper.yaml
@@ -0,0 +1,29 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: reaper-ui-secret
+data:
+  # username: reaper-jmx (actually)
+  username: cmVhcGVyLWpteA==
+  # password: R3ap3r
+  password: UjNhcDNy
+---
+apiVersion: reaper.k8ssandra.io/v1alpha1
+kind: Reaper
+metadata:
+  name: reaper1
+spec:
+  storageType: local
+  storageConfig:
+    accessModes:
+      - ReadWriteOnce
+    resources:
+      requests:
+        storage: 256Mi
+  httpManagement:
+    enabled: true
+  heapSize: 256Mi
+  autoScheduling:
+    enabled: false
+  uiUserSecretRef:
+    name: reaper-ui-secret