diff --git a/pom.xml b/pom.xml
index b754792d9..4bf985226 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.uid2</groupId>
     <artifactId>uid2-operator</artifactId>
-    <version>5.56.58</version>
+    <version>5.56.42-alpha-200-SNAPSHOT</version>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
diff --git a/src/main/java/com/uid2/operator/vertx/GenericFailureHandler.java b/src/main/java/com/uid2/operator/vertx/GenericFailureHandler.java
index 855ea1187..caa1b886e 100644
--- a/src/main/java/com/uid2/operator/vertx/GenericFailureHandler.java
+++ b/src/main/java/com/uid2/operator/vertx/GenericFailureHandler.java
@@ -1,5 +1,9 @@
 package com.uid2.operator.vertx;
 
+import com.uid2.shared.auth.IAuthorizable;
+import com.uid2.shared.auth.OperatorKey;
+import com.uid2.shared.middleware.AuthMiddleware;
+import com.uid2.shared.auth.ClientKey;
 import io.vertx.core.Handler;
 import io.vertx.core.http.HttpClosedException;
 import io.vertx.core.http.HttpServerResponse;
@@ -19,16 +23,22 @@ public void handle(RoutingContext ctx) {
         String url = ctx.normalizedPath();
         Throwable t = ctx.failure();
 
+        String contact = "unknown";
+        final ClientKey clientKey = (ClientKey) AuthMiddleware.getAuthClient(ctx);
+        if (clientKey != null) {
+            contact = clientKey.getContact();
+        }
+
         if (t != null) {
             // Because Vert.x swallows stack traces so cannot log stack trace
             // And we want to ignore HttpClosedException errors as it is (usually) caused by users and no impact
             if (t instanceof HttpClosedException) {
-                LOGGER.warn("Ignoring exception - URL: [{}] - Error:", url, t);
+                LOGGER.warn("Ignoring exception - URL: [{}], Participant: [{}] - Error:", url, contact, t);
                 response.end();
             } else if (statusCode >= 500 && statusCode < 600) { // 5xx is server error, so error
-                LOGGER.error("URL: [{}] - Error response code: [{}] - Error:", url, statusCode, t);
+                LOGGER.error("URL: [{}], Participant: [{}] - Error response code: [{}] - Error:", url, contact, statusCode, t);
             } else if (statusCode >= 400 && statusCode < 500) { // 4xx is user error, so just warn
-                LOGGER.warn("URL: [{}] - Error response code: [{}] - Error:", url, statusCode, t);
+                LOGGER.warn("URL: [{}], Participant: [{}] - Error response code: [{}] - Error:", url, contact, statusCode, t);
             }
         }