diff --git a/aws-runtime/aws-http/common/src/aws/sdk/kotlin/runtime/http/interceptors/UnsupportedSigningAlgorithmInterceptor.kt b/aws-runtime/aws-http/common/src/aws/sdk/kotlin/runtime/http/interceptors/UnsupportedSigningAlgorithmInterceptor.kt
index 4d0de0611e6..15d8df40f73 100644
--- a/aws-runtime/aws-http/common/src/aws/sdk/kotlin/runtime/http/interceptors/UnsupportedSigningAlgorithmInterceptor.kt
+++ b/aws-runtime/aws-http/common/src/aws/sdk/kotlin/runtime/http/interceptors/UnsupportedSigningAlgorithmInterceptor.kt
@@ -5,7 +5,8 @@
 package aws.sdk.kotlin.runtime.http.interceptors
 
 import aws.sdk.kotlin.runtime.InternalSdkApi
-import aws.smithy.kotlin.runtime.auth.awssigning.UnsupportedSigningAlgorithm
+import aws.smithy.kotlin.runtime.auth.awssigning.AwsSigningAlgorithm
+import aws.smithy.kotlin.runtime.auth.awssigning.UnsupportedSigningAlgorithmException
 import aws.smithy.kotlin.runtime.client.ResponseInterceptorContext
 import aws.smithy.kotlin.runtime.http.interceptors.HttpInterceptor
 import aws.smithy.kotlin.runtime.http.request.HttpRequest
@@ -20,10 +21,9 @@ import aws.smithy.kotlin.runtime.http.response.HttpResponse
 public class UnsupportedSigningAlgorithmInterceptor : HttpInterceptor {
     override suspend fun modifyBeforeCompletion(context: ResponseInterceptorContext<Any, Any, HttpRequest?, HttpResponse?>): Result<Any> {
         context.response.exceptionOrNull()?.let {
-            if (it is UnsupportedSigningAlgorithm && it.isSigV4a) {
-                throw UnsupportedSigningAlgorithm(
-                    it.message!!, // TODO: Add a message and link pointing to AWS SDK for Kotlin developer guide
-                    true,
+            if (it is UnsupportedSigningAlgorithmException && it.signingAlgorithm == AwsSigningAlgorithm.SIGV4_ASYMMETRIC) {
+                return Result.failure(
+                    it, // TODO: Add a message and link pointing to AWS SDK for Kotlin developer guide
                 )
             }
         }
diff --git a/aws-runtime/aws-http/common/test/aws/sdk/kotlin/runtime/http/interceptors/UnsupportedSigningAlgorithmInterceptorTest.kt b/aws-runtime/aws-http/common/test/aws/sdk/kotlin/runtime/http/interceptors/UnsupportedSigningAlgorithmInterceptorTest.kt
index 05025b42eca..7a5020aab9f 100644
--- a/aws-runtime/aws-http/common/test/aws/sdk/kotlin/runtime/http/interceptors/UnsupportedSigningAlgorithmInterceptorTest.kt
+++ b/aws-runtime/aws-http/common/test/aws/sdk/kotlin/runtime/http/interceptors/UnsupportedSigningAlgorithmInterceptorTest.kt
@@ -4,7 +4,8 @@
  */
 package aws.sdk.kotlin.runtime.http.interceptors
 
-import aws.smithy.kotlin.runtime.auth.awssigning.UnsupportedSigningAlgorithm
+import aws.smithy.kotlin.runtime.auth.awssigning.AwsSigningAlgorithm
+import aws.smithy.kotlin.runtime.auth.awssigning.UnsupportedSigningAlgorithmException
 import aws.smithy.kotlin.runtime.client.ResponseInterceptorContext
 import aws.smithy.kotlin.runtime.client.SdkClientOption
 import aws.smithy.kotlin.runtime.http.request.HttpRequest
@@ -13,42 +14,54 @@ import aws.smithy.kotlin.runtime.operation.ExecutionContext
 import kotlinx.coroutines.test.runTest
 import kotlin.test.Test
 import kotlin.test.assertEquals
-import kotlin.test.assertFails
+import kotlin.test.assertIs
+import kotlin.test.assertTrue
 
 class UnsupportedSigningAlgorithmInterceptorTest {
     @Test
     fun testUnsupportedSigningAlgorithmSigV4a() = runTest {
-        val exception = assertFails {
+        val result =
             UnsupportedSigningAlgorithmInterceptor()
                 .modifyBeforeCompletion(
                     context(
                         Result.failure(
-                            UnsupportedSigningAlgorithm(
+                            UnsupportedSigningAlgorithmException(
                                 "SIGV4A support is not yet implemented for the default signer.",
-                                true,
+                                AwsSigningAlgorithm.SIGV4_ASYMMETRIC,
                             ),
                         ),
                     ),
                 )
-        }
 
-        assertEquals(UnsupportedSigningAlgorithm::class, exception::class)
+        val exception = result.exceptionOrNull()
+
+        assertTrue(result.isFailure)
+        assertIs<UnsupportedSigningAlgorithmException>(exception)
+        assertEquals(exception.signingAlgorithm, AwsSigningAlgorithm.SIGV4_ASYMMETRIC)
         assertEquals("SIGV4A support is not yet implemented for the default signer.", exception.message)
     }
 
     @Test
-    fun testUnsupportedSigningAlgorithmNotSigV4aNoException() = runTest {
-        UnsupportedSigningAlgorithmInterceptor()
-            .modifyBeforeCompletion(
-                context(
-                    Result.failure(
-                        UnsupportedSigningAlgorithm(
-                            "SIGV5 support is not yet implemented for the default signer.",
-                            false,
+    fun testUnsupportedSigningAlgorithmNotSigV4a() = runTest {
+        val result =
+            UnsupportedSigningAlgorithmInterceptor()
+                .modifyBeforeCompletion(
+                    context(
+                        Result.failure(
+                            UnsupportedSigningAlgorithmException(
+                                "SIGV4 support is not yet implemented for the default signer.",
+                                AwsSigningAlgorithm.SIGV4,
+                            ),
                         ),
                     ),
-                ),
-            )
+                )
+
+        val exception = result.exceptionOrNull()
+
+        assertTrue(result.isFailure)
+        assertIs<UnsupportedSigningAlgorithmException>(exception)
+        assertEquals(exception.signingAlgorithm, AwsSigningAlgorithm.SIGV4)
+        assertEquals("SIGV4 support is not yet implemented for the default signer.", exception.message)
     }
 }
 
diff --git a/codegen/aws-sdk-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/customization/SigV4AsymmetricTraitCustomization.kt b/codegen/aws-sdk-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/customization/SigV4AsymmetricTraitCustomization.kt
index b1f94ee64ca..0fdabe539dd 100644
--- a/codegen/aws-sdk-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/customization/SigV4AsymmetricTraitCustomization.kt
+++ b/codegen/aws-sdk-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/customization/SigV4AsymmetricTraitCustomization.kt
@@ -21,6 +21,7 @@ import software.amazon.smithy.model.transform.ModelTransformer
  * NOTE: Won't add sigV4 trait (services that support sigV4A MUST support sigV4)
  */
 class SigV4AsymmetricTraitCustomization : KotlinIntegration {
+    // Needs to happen before the `SigV4AsymmetricAuthSchemeIntegration` & `SigV4AuthSchemeIntegration` (-50 & -50)
     override val order: Byte = -60
 
     override fun enabledForService(model: Model, settings: KotlinSettings): Boolean =