diff --git a/wrapper/src/main/java/software/amazon/jdbc/plugin/iam/IamAuthConnectionPlugin.java b/wrapper/src/main/java/software/amazon/jdbc/plugin/iam/IamAuthConnectionPlugin.java
index 4b0e75654..c6d95bbad 100644
--- a/wrapper/src/main/java/software/amazon/jdbc/plugin/iam/IamAuthConnectionPlugin.java
+++ b/wrapper/src/main/java/software/amazon/jdbc/plugin/iam/IamAuthConnectionPlugin.java
@@ -258,6 +258,13 @@ String generateAuthenticationToken(
 
     try {
       final String user = PropertyDefinition.USER.getString(props);
+      if (StringUtils.isNullOrEmpty(user)) {
+        throw new RuntimeException(
+            Messages.get(
+                "IamAuthConnectionPlugin.missingRequiredConfigParameter",
+                new Object[] {PropertyDefinition.USER.name}));
+      }
+
       final AwsCredentialsProvider credentialsProvider = AwsCredentialsManager.getProvider(originalHostSpec, props);
       return this.iamTokenUtility.generateAuthenticationToken(credentialsProvider, region, hostname, port, user);
 
diff --git a/wrapper/src/main/resources/aws_advanced_jdbc_wrapper_messages.properties b/wrapper/src/main/resources/aws_advanced_jdbc_wrapper_messages.properties
index ba8e4a0b3..5be0bbc04 100644
--- a/wrapper/src/main/resources/aws_advanced_jdbc_wrapper_messages.properties
+++ b/wrapper/src/main/resources/aws_advanced_jdbc_wrapper_messages.properties
@@ -192,6 +192,7 @@ IamAuthConnectionPlugin.generatedNewIamToken=Generated new IAM token = ''{0}''
 IamAuthConnectionPlugin.unhandledException=Unhandled exception: ''{0}''
 IamAuthConnectionPlugin.connectException=Error occurred while opening a connection: ''{0}''
 IamAuthConnectionPlugin.javaSdkNotInClasspath=Required dependency 'AWS IAM Authentication Plugin' is not on the classpath.
+IamAuthConnectionPlugin.missingRequiredConfigParameter=Configuration parameter ''{0}'' is required.
 
 # Log Query Connection Plugin
 LogQueryConnectionPlugin.executingQuery=[{0}] Executing query: {1}
diff --git a/wrapper/src/test/java/integration/container/tests/AwsIamIntegrationTest.java b/wrapper/src/test/java/integration/container/tests/AwsIamIntegrationTest.java
index 0997980f9..a1975fc64 100644
--- a/wrapper/src/test/java/integration/container/tests/AwsIamIntegrationTest.java
+++ b/wrapper/src/test/java/integration/container/tests/AwsIamIntegrationTest.java
@@ -16,6 +16,7 @@
 
 package integration.container.tests;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import integration.DriverHelper;
@@ -40,9 +41,18 @@
 import org.junit.jupiter.api.TestMethodOrder;
 import org.junit.jupiter.api.TestTemplate;
 import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mockito;
+import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
+import software.amazon.awssdk.regions.Region;
+import software.amazon.jdbc.HostSpec;
+import software.amazon.jdbc.HostSpecBuilder;
 import software.amazon.jdbc.PropertyDefinition;
+import software.amazon.jdbc.authentication.AwsCredentialsManager;
 import software.amazon.jdbc.ds.AwsWrapperDataSource;
+import software.amazon.jdbc.hostavailability.HostAvailabilityStrategy;
 import software.amazon.jdbc.plugin.iam.IamAuthConnectionPlugin;
+import software.amazon.jdbc.plugin.iam.LightRdsUtility;
+import software.amazon.jdbc.plugin.iam.RegularRdsUtility;
 
 @TestMethodOrder(MethodOrderer.MethodName.class)
 @ExtendWith(TestDriverProvider.class)
@@ -236,6 +246,37 @@ void test_AwsIam_UserAndPasswordPropertiesArePreserved() throws SQLException {
     }
   }
 
+  @TestTemplate
+  void test_TokenGenerators() {
+
+    final HostAvailabilityStrategy mockHostAvailabilityStrategy = Mockito.mock(HostAvailabilityStrategy.class);
+
+    final Properties awsIamProp =
+        initAwsIamProps(TestEnvironment.getCurrent().getInfo().getIamUsername(), "<anything>");
+
+    final HostSpec hostSpec = new HostSpecBuilder(mockHostAvailabilityStrategy)
+        .host(TestEnvironment.getCurrent().getInfo().getDatabaseInfo().getClusterEndpoint())
+        .build();
+
+    final AwsCredentialsProvider credentialsProvider = AwsCredentialsManager.getProvider(hostSpec, awsIamProp);
+
+    final String regularToken = new RegularRdsUtility().generateAuthenticationToken(
+        credentialsProvider,
+        Region.of(TestEnvironment.getCurrent().getInfo().getAuroraRegion()),
+        TestEnvironment.getCurrent().getInfo().getDatabaseInfo().getClusterEndpoint(),
+        TestEnvironment.getCurrent().getInfo().getDatabaseInfo().getClusterReadOnlyEndpointPort(),
+        TestEnvironment.getCurrent().getInfo().getIamUsername());
+
+    final String lightToken = new LightRdsUtility().generateAuthenticationToken(
+        credentialsProvider,
+        Region.of(TestEnvironment.getCurrent().getInfo().getAuroraRegion()),
+        TestEnvironment.getCurrent().getInfo().getDatabaseInfo().getClusterEndpoint(),
+        TestEnvironment.getCurrent().getInfo().getDatabaseInfo().getClusterReadOnlyEndpointPort(),
+        TestEnvironment.getCurrent().getInfo().getIamUsername());
+
+    assertEquals(regularToken, lightToken);
+  }
+
   protected Properties initAwsIamProps(String user, String password) {
     final Properties props = ConnectionStringHelper.getDefaultProperties();
     props.setProperty(PropertyDefinition.PLUGINS.name, "iam");