diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2mSessionMsgListener.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2mSessionMsgListener.java
index f5920cbddd..ec688bfffa 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2mSessionMsgListener.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2mSessionMsgListener.java
@@ -67,7 +67,7 @@ public class LwM2mSessionMsgListener implements GenericFutureListener<Future<? s
 
     @Override
     public void onToTransportUpdateCredentials(ToTransportUpdateCredentialsProto updateCredentials) {
-        this.handler.onToTransportUpdateCredentials(updateCredentials);
+        this.handler.onToTransportUpdateCredentials(sessionInfo, updateCredentials);
     }
 
     @Override
diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2mClientContext.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2mClientContext.java
index 792946e1c3..8b8186f3db 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2mClientContext.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2mClientContext.java
@@ -56,4 +56,6 @@ public interface LwM2mClientContext {
     void registerClient(Registration registration, ValidateDeviceCredentialsResponse credentials);
 
     void update(LwM2mClient lwM2MClient);
+
+    void removeCredentials(TransportProtos.SessionInfoProto sessionInfo);
 }
diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2mClientContextImpl.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2mClientContextImpl.java
index c15f4f3a9c..261220f013 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2mClientContextImpl.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2mClientContextImpl.java
@@ -228,6 +228,11 @@ public class LwM2mClientContextImpl implements LwM2mClientContext {
         }
     }
 
+    @Override
+    public void removeCredentials(TransportProtos.SessionInfoProto sessionInfo) {
+        //TODO: implement
+    }
+
     @Override
     public Collection<LwM2mClient> getLwM2mClients() {
         return lwM2mClientsByEndpoint.values();
diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/downlink/DefaultLwM2mDownlinkMsgHandler.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/downlink/DefaultLwM2mDownlinkMsgHandler.java
index 1ed7349d04..238f948939 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/downlink/DefaultLwM2mDownlinkMsgHandler.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/downlink/DefaultLwM2mDownlinkMsgHandler.java
@@ -132,7 +132,7 @@ public class DefaultLwM2mDownlinkMsgHandler extends LwM2MExecutorAwareService im
             log.info("[{}] Send observation: {}.", client.getEndpoint(), request.getVersionedId());
             sendRequest(client, downlink, request.getTimeout(), callback);
         } else {
-            callback.onError("Observation is already registered!", new RuntimeException());
+            callback.onValidationError(resultIds.toString(), "Observation is already registered!");
         }
     }
 
diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/uplink/DefaultLwM2MUplinkMsgHandler.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/uplink/DefaultLwM2MUplinkMsgHandler.java
index 7031ee3c8e..9851612614 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/uplink/DefaultLwM2MUplinkMsgHandler.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/uplink/DefaultLwM2MUplinkMsgHandler.java
@@ -824,12 +824,13 @@ public class DefaultLwM2MUplinkMsgHandler extends LwM2MExecutorAwareService impl
     }
 
     /**
+     * @param sessionInfo
      * @param updateCredentials - Credentials include config only security Client (without config attr/telemetry...)
-     *                          config attr/telemetry... in profile
      */
     @Override
-    public void onToTransportUpdateCredentials(TransportProtos.ToTransportUpdateCredentialsProto updateCredentials) {
+    public void onToTransportUpdateCredentials(SessionInfoProto sessionInfo, TransportProtos.ToTransportUpdateCredentialsProto updateCredentials) {
         log.info("[{}] idList [{}] valueList updateCredentials", updateCredentials.getCredentialsIdList(), updateCredentials.getCredentialsValueList());
+        this.clientContext.removeCredentials(sessionInfo);
     }
 
     /**
diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/uplink/LwM2mUplinkMsgHandler.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/uplink/LwM2mUplinkMsgHandler.java
index dd693450ec..ca01d197e8 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/uplink/LwM2mUplinkMsgHandler.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/uplink/LwM2mUplinkMsgHandler.java
@@ -52,7 +52,7 @@ public interface LwM2mUplinkMsgHandler {
 
     void onWriteResponseOk(LwM2mClient client, String path, WriteRequest request);
 
-    void onToTransportUpdateCredentials(TransportProtos.ToTransportUpdateCredentialsProto updateCredentials);
+    void onToTransportUpdateCredentials(TransportProtos.SessionInfoProto sessionInfo, TransportProtos.ToTransportUpdateCredentialsProto updateCredentials);
 
     LwM2MTransportServerConfig getConfig();
 }