diff --git a/src/main/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/client/PersonalizeClient.java b/src/main/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/client/PersonalizeClient.java
index 22c5130..1f298dd 100644
--- a/src/main/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/client/PersonalizeClient.java
+++ b/src/main/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/client/PersonalizeClient.java
@@ -8,6 +8,7 @@
 package org.opensearch.search.relevance.transformer.personalizeintelligentranking.client;
 
 import com.amazonaws.AmazonServiceException;
+import com.amazonaws.ClientConfiguration;
 import com.amazonaws.auth.AWSCredentialsProvider;
 import com.amazonaws.services.personalizeruntime.AmazonPersonalizeRuntime;
 import com.amazonaws.services.personalizeruntime.AmazonPersonalizeRuntimeClientBuilder;
@@ -24,6 +25,7 @@
  */
 public class PersonalizeClient implements Closeable {
     private final AmazonPersonalizeRuntime personalizeRuntime;
+    private static final String USER_AGENT_PREFIX = "PersonalizeOpenSearchPlugin";
 
     /**
      * Constructor for Amazon Personalize client
@@ -31,10 +33,13 @@ public class PersonalizeClient implements Closeable {
      * @param awsRegion AWS region where Amazon Personalize campaign is hosted
      */
     public PersonalizeClient(AWSCredentialsProvider credentialsProvider, String awsRegion) {
+        ClientConfiguration clientConfiguration = new ClientConfiguration()
+                .withUserAgentPrefix(USER_AGENT_PREFIX);
         personalizeRuntime = AccessController.doPrivileged(
                 (PrivilegedAction<AmazonPersonalizeRuntime>) () -> AmazonPersonalizeRuntimeClientBuilder.standard()
                         .withCredentials(credentialsProvider)
                         .withRegion(awsRegion)
+                        .withClientConfiguration(clientConfiguration)
                         .build());
     }
 
diff --git a/src/main/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/utils/ValidationUtil.java b/src/main/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/utils/ValidationUtil.java
index c298292..afd84b6 100644
--- a/src/main/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/utils/ValidationUtil.java
+++ b/src/main/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/utils/ValidationUtil.java
@@ -54,7 +54,7 @@ private static boolean isValidCampaignOrRoleArn(String arn, String expectedServi
         try {
             Arn arnObj = Arn.fromString(arn);
             String arnService = arnObj.getService();
-            if (arnObj.getResource() == null || !arnService.equals(expectedService)) {
+            if (!arnService.equals(expectedService)) {
                 return false;
             }
         } catch (IllegalArgumentException iae) {
diff --git a/src/test/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/utils/ValidationUtilTests.java b/src/test/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/utils/ValidationUtilTests.java
index ea16274..537d78f 100644
--- a/src/test/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/utils/ValidationUtilTests.java
+++ b/src/test/java/org/opensearch/search/relevance/transformer/personalizeintelligentranking/utils/ValidationUtilTests.java
@@ -19,7 +19,7 @@ public class ValidationUtilTests extends OpenSearchTestCase {
     private static final String TYPE = "personalize_ranking";
     private static final String TAG = "test_tag";
     private String personalizeCampaign = "arn:aws:personalize:us-west-2:000000000000:campaign/test-campaign";
-    private String iamRoleArn = "arn:aws:iam::493477146422:role/PersonalizeOSTest";
+    private String iamRoleArn = "arn:aws:iam::000000000000:role/test";
     private String itemIdField = "ITEM_ID";
     private String region = "us-west-2";
     private double weight = 1.0;
@@ -37,6 +37,13 @@ public void testInvalidCampaignArn () {
                 ValidationUtil.validatePersonalizeIntelligentRankerConfiguration(rankerConfig, TYPE, TAG));
     }
 
+    public void testEmptyCampaignArn () {
+        PersonalizeIntelligentRankerConfiguration rankerConfig =
+                new PersonalizeIntelligentRankerConfiguration("", iamRoleArn, AMAZON_PERSONALIZED_RANKING_RECIPE_NAME, itemIdField, region, weight);
+        expectThrows(OpenSearchParseException.class, () ->
+                ValidationUtil.validatePersonalizeIntelligentRankerConfiguration(rankerConfig, TYPE, TAG));
+    }
+
     public void testNonPersonalizeArnAsCampaignArn () {
         PersonalizeIntelligentRankerConfiguration rankerConfig =
                 new PersonalizeIntelligentRankerConfiguration("arn:aws:es:us-west-2:000000000000:domain/testmovies", iamRoleArn, AMAZON_PERSONALIZED_RANKING_RECIPE_NAME, itemIdField, region, weight);
@@ -58,6 +65,12 @@ public void testNonIamArnAsIamRoleArn () {
                 ValidationUtil.validatePersonalizeIntelligentRankerConfiguration(rankerConfig, TYPE, TAG));
     }
 
+    public void testEmptyIamRoleArnAllowed () {
+        PersonalizeIntelligentRankerConfiguration rankerConfig =
+                new PersonalizeIntelligentRankerConfiguration(personalizeCampaign, "", AMAZON_PERSONALIZED_RANKING_RECIPE_NAME, itemIdField, region, weight);
+        ValidationUtil.validatePersonalizeIntelligentRankerConfiguration(rankerConfig, TYPE, TAG);
+    }
+
     public void testInvalidWeightValueGreaterThanRange () {
         PersonalizeIntelligentRankerConfiguration rankerConfig =
                 new PersonalizeIntelligentRankerConfiguration(personalizeCampaign, iamRoleArn, AMAZON_PERSONALIZED_RANKING_RECIPE_NAME, itemIdField, region, 3.0);