diff --git a/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/GatewayService.java b/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/GatewayService.java
index 9b11ed71a1868..da7621b794062 100644
--- a/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/GatewayService.java
+++ b/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/GatewayService.java
@@ -12,28 +12,30 @@
  */
 package org.openhab.binding.thekeys.internal.api;
 
+import java.io.EOFException;
+import java.io.IOException;
+import java.net.ConnectException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.time.Instant;
+import java.util.Base64;
+import java.util.List;
+
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
+
 import org.eclipse.jdt.annotation.NonNullByDefault;
 import org.openhab.binding.thekeys.internal.api.model.GatewayInfosDTO;
 import org.openhab.binding.thekeys.internal.api.model.LockerDTO;
 import org.openhab.binding.thekeys.internal.api.model.LockerStatusDTO;
 import org.openhab.binding.thekeys.internal.api.model.LockersDTO;
 import org.openhab.binding.thekeys.internal.api.model.OpenCloseDTO;
+import org.openhab.binding.thekeys.internal.api.model.SynchronizeDTO;
 import org.openhab.binding.thekeys.internal.gateway.TheKeysGatewayConfiguration;
 import org.openhab.binding.thekeys.internal.utils.ExceptionUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.crypto.Mac;
-import javax.crypto.spec.SecretKeySpec;
-import java.io.EOFException;
-import java.io.IOException;
-import java.net.ConnectException;
-import java.security.InvalidKeyException;
-import java.security.NoSuchAlgorithmException;
-import java.time.Instant;
-import java.util.Base64;
-import java.util.List;
-
 /**
  * Implement the communication with the Gateway via HTTP
  *
@@ -77,6 +79,20 @@ public LockerStatusDTO getLockStatus(int lockId) throws IOException {
         return post("/locker_status", LockerStatusDTO.class, lockId);
     }
 
+    /**
+     * Synchronize the gateway
+     */
+    public SynchronizeDTO synchronizeGateway() throws IOException {
+        return get("/synchronize", SynchronizeDTO.class);
+    }
+
+    /**
+     * Synchronize the gateway
+     */
+    public SynchronizeDTO synchronizeLock() throws IOException {
+        return get("/locker/synchronize", SynchronizeDTO.class);
+    }
+
     /**
      * Open operation of the lock
      *
diff --git a/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/model/LockerStatusDTO.java b/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/model/LockerStatusDTO.java
index 08f86a99e83d7..207d24e16db42 100644
--- a/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/model/LockerStatusDTO.java
+++ b/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/model/LockerStatusDTO.java
@@ -19,11 +19,13 @@
  */
 public class LockerStatusDTO {
 
+    public static final int NEED_RESYNC = 0x26;
     public static final int CODE_LOCK_CLOSE = 0x31;
     public static final int CODE_LOCK_OPEN = 0x32;
 
     private String status;
     private int code;
+    private String cause;
     private int id;
     private int version;
     private int position;
@@ -86,6 +88,14 @@ public void setBattery(int battery) {
         this.battery = battery;
     }
 
+    public String getCause() {
+        return cause;
+    }
+
+    public void setCause(String cause) {
+        this.cause = cause;
+    }
+
     public boolean isClosed() {
         return CODE_LOCK_CLOSE == code;
     }
@@ -93,4 +103,8 @@ public boolean isClosed() {
     public boolean isOpened() {
         return CODE_LOCK_OPEN == code;
     }
+
+    public boolean isNeedResync() {
+        return NEED_RESYNC == code;
+    }
 }
diff --git a/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/model/SynchronizeDTO.java b/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/model/SynchronizeDTO.java
new file mode 100644
index 0000000000000..42c048207e349
--- /dev/null
+++ b/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/api/model/SynchronizeDTO.java
@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) 2010-2023 Contributors to the openHAB project
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package org.openhab.binding.thekeys.internal.api.model;
+
+/**
+ * Response DTO for /locker_status endpoint
+ *
+ * @author Jordan Martin - Initial contribution
+ */
+public class SynchronizeDTO {
+
+    private String status;
+    private int code;
+    private String message;
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    public int getCode() {
+        return code;
+    }
+
+    public void setCode(int code) {
+        this.code = code;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+}
diff --git a/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/smartlock/TheKeysSmartlockHandler.java b/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/smartlock/TheKeysSmartlockHandler.java
index ea8f51ff50bf7..d7a5481392b2c 100644
--- a/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/smartlock/TheKeysSmartlockHandler.java
+++ b/bundles/org.openhab.binding.thekeys/src/main/java/org/openhab/binding/thekeys/internal/smartlock/TheKeysSmartlockHandler.java
@@ -129,7 +129,8 @@ private boolean fetchAndUpdateLockStatus() {
             updateState(CHANNEL_SYNC_IN_PROGRESS, OnOffType.ON);
             LockerStatusDTO lockStatus = gatewayApi().getLockStatus(config.lockId);
             if ("ko".equals(lockStatus.getStatus())) {
-                throw new TheKeysError("Request failed with code " + lockStatus.getCode());
+                throw new TheKeysError(
+                        "Request failed with code " + lockStatus.getCode() + ". " + lockStatus.getCause());
             }
 
             updateState(CHANNEL_STATUS, new StringType(lockStatus.getStatus()));