diff --git a/src/Amazon.Extensions.CognitoAuthentication/CognitoUserAuthentication.cs b/src/Amazon.Extensions.CognitoAuthentication/CognitoUserAuthentication.cs
index b876b31..1b16a9e 100644
--- a/src/Amazon.Extensions.CognitoAuthentication/CognitoUserAuthentication.cs
+++ b/src/Amazon.Extensions.CognitoAuthentication/CognitoUserAuthentication.cs
@@ -63,6 +63,11 @@ public virtual async Task<AuthFlowResponse> StartWithSrpAuthAsync(InitiateSrpAut
             Tuple<BigInteger, BigInteger> tupleAa = AuthenticationHelper.CreateAaTuple();
             InitiateAuthRequest initiateRequest = CreateSrpAuthRequest(tupleAa);
 
+            if (srpRequest.ClientMetadata != null)
+            {
+                initiateRequest.ClientMetadata = new Dictionary<string, string>(srpRequest.ClientMetadata);
+            }
+
             if (srpRequest.IsCustomAuthFlow)
             {
                 initiateRequest.AuthFlow = AuthFlowType.CUSTOM_AUTH;