diff --git a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/MQTTUtils.java b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/MQTTUtils.java
index f26ecec12..71504d068 100644
--- a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/MQTTUtils.java
+++ b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/MQTTUtils.java
@@ -314,7 +314,6 @@ public class MQTTUtils extends Thread implements IMqttActionListener, MqttCallba
                 params.put( "dbg", BuildConfig.DEBUG );
                 params.put( "myNow", now );
                 params.put( "loc", LocUtils.getCurLocale( mContext ) );
-                params.put( "knowsDup", true );
                 params.put( "tmpKey", getTmpKey(mContext) );
 
                 String fcmid = FBMService.getFCMDevID( mContext );