diff --git a/libraries/Microsoft.Bot.Connector/Authentication/MsalServiceClientCredentialsFactory.cs b/libraries/Microsoft.Bot.Connector/Authentication/MsalServiceClientCredentialsFactory.cs
index 27f6c33d04..d1b8f77287 100644
--- a/libraries/Microsoft.Bot.Connector/Authentication/MsalServiceClientCredentialsFactory.cs
+++ b/libraries/Microsoft.Bot.Connector/Authentication/MsalServiceClientCredentialsFactory.cs
@@ -18,6 +18,7 @@ namespace Microsoft.Bot.Connector.Authentication
     /// <summary>
     /// Credential factory that uses MSAL to acquire tokens.
     /// </summary>
+    [Obsolete("Use the ServiceClientCredentialsFactory implementation that corresponds to the authentication type (MSI, Certificate, Federated, etc.).", false)]
     public class MsalServiceClientCredentialsFactory : ServiceClientCredentialsFactory
     {
         private readonly IConfidentialClientApplication _clientApplication;