diff --git a/src/client/Microsoft.Identity.Client/ApiConfig/AcquireTokenByUsernameAndPasswordConfidentialParameterBuilder.cs b/src/client/Microsoft.Identity.Client/ApiConfig/AcquireTokenByUsernameAndPasswordConfidentialParameterBuilder.cs
index 801e6409cd..04995d6614 100644
--- a/src/client/Microsoft.Identity.Client/ApiConfig/AcquireTokenByUsernameAndPasswordConfidentialParameterBuilder.cs
+++ b/src/client/Microsoft.Identity.Client/ApiConfig/AcquireTokenByUsernameAndPasswordConfidentialParameterBuilder.cs
@@ -18,7 +18,7 @@
 namespace Microsoft.Identity.Client
 {
     /// <summary>
-    /// Parameter builder for the <see cref="IConfidentialClientApplication.AcquireTokenByUsernamePassword(IEnumerable{string}, string, string)"/>
+    /// Parameter builder for the <see cref="IByUsernameAndPassword.AcquireTokenByUsernamePassword(IEnumerable{string}, string, string)"/>
     /// operation. See https://aka.ms/msal-net-up
     /// </summary>
     public sealed class AcquireTokenByUsernameAndPasswordConfidentialParameterBuilder :
@@ -67,5 +67,16 @@ internal override ApiEvent.ApiIds CalculateApiEventId()
         {
             return ApiEvent.ApiIds.AcquireTokenByUsernamePassword;
         }
+
+        /// <inheritdoc/>
+        protected override void Validate()
+        {
+            base.Validate();
+
+            if (Parameters.SendX5C == null)
+            {
+                Parameters.SendX5C = ServiceBundle.Config?.SendX5C ?? false;
+            }
+        }
     }
 }
diff --git a/src/client/Microsoft.Identity.Client/ApiConfig/Executors/ConfidentialClientExecutor.cs b/src/client/Microsoft.Identity.Client/ApiConfig/Executors/ConfidentialClientExecutor.cs
index 97bfb4a884..6ae2e3858d 100644
--- a/src/client/Microsoft.Identity.Client/ApiConfig/Executors/ConfidentialClientExecutor.cs
+++ b/src/client/Microsoft.Identity.Client/ApiConfig/Executors/ConfidentialClientExecutor.cs
@@ -142,6 +142,8 @@ public async Task<AuthenticationResult> ExecuteAsync(
                 commonParameters,
                 requestContext,
                 _confidentialClientApplication.UserTokenCacheInternal).ConfigureAwait(false);
+            
+            requestParams.SendX5C = usernamePasswordParameters.SendX5C ?? false;
 
             var handler = new UsernamePasswordRequest(
                 ServiceBundle,
diff --git a/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AbstractAcquireTokenConfidentialClientParameters.cs b/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AbstractAcquireTokenConfidentialClientParameters.cs
index db63a4fb9e..6237f45345 100644
--- a/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AbstractAcquireTokenConfidentialClientParameters.cs
+++ b/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AbstractAcquireTokenConfidentialClientParameters.cs
@@ -20,10 +20,5 @@ internal abstract class AbstractAcquireTokenConfidentialClientParameters
         /// This overrides application config settings.
         /// </summary>
         public bool? SendX5C { get; set; }
-
-        /// <summary>
-        /// if <c>true</c> then Spa code param will be sent via AcquireTokenByAuthorizeCode
-        /// </summary>
-        public bool SpaCode { get; set; }
     }
 }
diff --git a/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AcquireTokenByAuthorizationCodeParameters.cs b/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AcquireTokenByAuthorizationCodeParameters.cs
index 31228b55a9..3e41c579c8 100644
--- a/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AcquireTokenByAuthorizationCodeParameters.cs
+++ b/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AcquireTokenByAuthorizationCodeParameters.cs
@@ -11,6 +11,11 @@ internal class AcquireTokenByAuthorizationCodeParameters : AbstractAcquireTokenC
 
         public string PkceCodeVerifier { get; set; }
 
+        /// <summary>
+        /// if <c>true</c> then Spa code param will be sent via AcquireTokenByAuthorizeCode
+        /// </summary>
+        public bool SpaCode { get; set; }
+
         public void LogParameters(ILoggerAdapter logger)
         {
         }
diff --git a/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AcquireTokenByUsernamePasswordParameters.cs b/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AcquireTokenByUsernamePasswordParameters.cs
index bbcaf230a0..17ec6e79f4 100644
--- a/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AcquireTokenByUsernamePasswordParameters.cs
+++ b/src/client/Microsoft.Identity.Client/ApiConfig/Parameters/AcquireTokenByUsernamePasswordParameters.cs
@@ -2,14 +2,18 @@
 // Licensed under the MIT License.
 
 using System.Security;
+using System.Text;
 using Microsoft.Identity.Client.Core;
 
 namespace Microsoft.Identity.Client.ApiConfig.Parameters
 {
+    
     internal class AcquireTokenByUsernamePasswordParameters : AbstractAcquireTokenByUsernameParameters, IAcquireTokenParameters
     {
         public string Password { get; set; }
 
+        public bool? SendX5C { get; set; } // CCA only
+
         /// <inheritdoc/>
         public void LogParameters(ILoggerAdapter logger)
         {
diff --git a/tests/Microsoft.Identity.Test.Integration.netcore/HeadlessTests/UsernamePasswordIntegrationTests.NetFwk.cs b/tests/Microsoft.Identity.Test.Integration.netcore/HeadlessTests/UsernamePasswordIntegrationTests.NetFwk.cs
index e9238b5460..d4d1f7f0b8 100644
--- a/tests/Microsoft.Identity.Test.Integration.netcore/HeadlessTests/UsernamePasswordIntegrationTests.NetFwk.cs
+++ b/tests/Microsoft.Identity.Test.Integration.netcore/HeadlessTests/UsernamePasswordIntegrationTests.NetFwk.cs
@@ -275,13 +275,22 @@ private async Task RunHappyPathTestAsync(LabResponse labResponse, string federat
             else
             {
                 IConfidentialAppSettings settings = ConfidentialAppSettings.GetSettings(cloud);
-                clientApp = ConfidentialClientApplicationBuilder
+                var clientAppBuilder = ConfidentialClientApplicationBuilder
                             .Create(settings.ClientId)
                             .WithTestLogging()
                             .WithHttpClientFactory(factory)
-                            .WithAuthority(labResponse.Lab.Authority, "organizations")
-                            .WithClientSecret(settings.GetSecret())
-                            .Build();
+                            .WithAuthority(labResponse.Lab.Authority, "organizations");
+
+                if (cloud == Cloud.Arlington)
+                {
+                    clientAppBuilder.WithClientSecret(settings.GetSecret());
+                }
+                else
+                {
+                    clientAppBuilder.WithCertificate(settings.GetCertificate(), true);
+                }
+
+                 clientApp = clientAppBuilder.Build();
             }
 
             AuthenticationResult authResult
diff --git a/tests/Microsoft.Identity.Test.Unit/PublicApiTests/ClientCredentialWithCertTest.cs b/tests/Microsoft.Identity.Test.Unit/PublicApiTests/ClientCredentialWithCertTest.cs
index 453a33e361..96f6198245 100644
--- a/tests/Microsoft.Identity.Test.Unit/PublicApiTests/ClientCredentialWithCertTest.cs
+++ b/tests/Microsoft.Identity.Test.Unit/PublicApiTests/ClientCredentialWithCertTest.cs
@@ -669,6 +669,41 @@ await app.AcquireTokenByAuthorizationCode(TestConstants.s_scope, TestConstants.D
             }
         }
 
+
+        // regression test for https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/issues/4913
+        [DataTestMethod]
+        [DataRow(true)]
+        [DataRow(false)]
+        public async Task RopcCcaSendsX5CAsync(bool sendX5C)
+        {
+            using (var harness = CreateTestHarness())
+            {
+                var certificate = CertHelper.GetOrCreateTestCert();
+                var exportedCertificate = Convert.ToBase64String(certificate.Export(X509ContentType.Cert));
+
+                var app = ConfidentialClientApplicationBuilder
+                    .Create(TestConstants.ClientId)
+                    .WithHttpManager(harness.HttpManager)
+                    .WithCertificate(certificate, sendX5C)
+                    .Build();
+
+                harness.HttpManager.AddInstanceDiscoveryMockHandler();
+
+                harness.HttpManager.AddMockHandler(
+                    CreateTokenResponseHttpHandlerWithX5CValidation(
+                        clientCredentialFlow: false, 
+                        expectedX5C: sendX5C ? exportedCertificate: null));
+
+                var result = await (app as IByUsernameAndPassword)
+                    .AcquireTokenByUsernamePassword(
+                        TestConstants.s_scope,
+                        TestConstants.Username,
+                        TestConstants.DefaultPassword)
+                    .ExecuteAsync()
+                    .ConfigureAwait(false);
+            }
+        }
+
         private static string ComputeCertThumbprint(X509Certificate2 certificate, bool useSha2)
         {
             string thumbprint = null;