diff --git a/muted-tests.yml b/muted-tests.yml
index b065e52082e91..f99078f7bab23 100644
--- a/muted-tests.yml
+++ b/muted-tests.yml
@@ -624,9 +624,6 @@ tests:
 - class: org.elasticsearch.xpack.restart.FullClusterRestartIT
   method: testDataStreams {cluster=UPGRADED}
   issue: https://github.com/elastic/elasticsearch/issues/136353
-- class: org.elasticsearch.xpack.remotecluster.RemoteClusterSecurityBWCToRCS2ClusterRestIT
-  method: testBwcCCSViaRCS1orRCS2
-  issue: https://github.com/elastic/elasticsearch/issues/136368
 - class: org.elasticsearch.xpack.restart.FullClusterRestartIT
   method: testServiceAccountApiKey {cluster=UPGRADED}
   issue: https://github.com/elastic/elasticsearch/issues/136390
diff --git a/x-pack/plugin/security/qa/multi-cluster/src/javaRestTest/java/org/elasticsearch/xpack/remotecluster/RemoteClusterSecurityBWCToRCS2ClusterRestIT.java b/x-pack/plugin/security/qa/multi-cluster/src/javaRestTest/java/org/elasticsearch/xpack/remotecluster/RemoteClusterSecurityBWCToRCS2ClusterRestIT.java
index 05d0218b65292..c62a18602ae2d 100644
--- a/x-pack/plugin/security/qa/multi-cluster/src/javaRestTest/java/org/elasticsearch/xpack/remotecluster/RemoteClusterSecurityBWCToRCS2ClusterRestIT.java
+++ b/x-pack/plugin/security/qa/multi-cluster/src/javaRestTest/java/org/elasticsearch/xpack/remotecluster/RemoteClusterSecurityBWCToRCS2ClusterRestIT.java
@@ -40,6 +40,8 @@ public class RemoteClusterSecurityBWCToRCS2ClusterRestIT extends AbstractRemoteC
             .setting("xpack.ml.enabled", "false")
             .setting("remote_cluster_server.enabled", "true")
             .setting("remote_cluster.port", "0")
+            .setting("cluster.remote.signing.certificate_authorities", "signing.crt")
+            .configFile("signing.crt", Resource.fromClasspath("signing/signing.crt"))
             .setting("xpack.security.remote_cluster_server.ssl.enabled", "true")
             .setting("xpack.security.remote_cluster_server.ssl.key", "remote-cluster.key")
             .setting("xpack.security.remote_cluster_server.ssl.certificate", "remote-cluster.crt")