diff --git a/src/Billing/Services/Implementations/UpcomingInvoiceHandler.cs b/src/Billing/Services/Implementations/UpcomingInvoiceHandler.cs
index f24229f151..7a58f84cd4 100644
--- a/src/Billing/Services/Implementations/UpcomingInvoiceHandler.cs
+++ b/src/Billing/Services/Implementations/UpcomingInvoiceHandler.cs
@@ -177,7 +177,8 @@ public class UpcomingInvoiceHandler(
                         Discounts =
                         [
                             new SubscriptionDiscountOptions { Coupon = CouponIDs.Milestone2SubscriptionDiscount }
-                        ]
+                        ],
+                        ProrationBehavior = "none"
                     });
             }
             catch (Exception exception)
diff --git a/src/Core/Billing/Pricing/PricingClient.cs b/src/Core/Billing/Pricing/PricingClient.cs
index 0c4266665a..1ec44c6496 100644
--- a/src/Core/Billing/Pricing/PricingClient.cs
+++ b/src/Core/Billing/Pricing/PricingClient.cs
@@ -123,9 +123,7 @@ public class PricingClient(
             return [CurrentPremiumPlan];
         }
 
-        var milestone2Feature = featureService.IsEnabled(FeatureFlagKeys.PM23341_Milestone_2);
-
-        var response = await httpClient.GetAsync($"plans/premium?milestone2={milestone2Feature}");
+        var response = await httpClient.GetAsync("plans/premium");
 
         if (response.IsSuccessStatusCode)
         {
diff --git a/test/Billing.Test/Services/UpcomingInvoiceHandlerTests.cs b/test/Billing.Test/Services/UpcomingInvoiceHandlerTests.cs
index 899df4ea53..913355f2db 100644
--- a/test/Billing.Test/Services/UpcomingInvoiceHandlerTests.cs
+++ b/test/Billing.Test/Services/UpcomingInvoiceHandlerTests.cs
@@ -268,7 +268,8 @@ public class UpcomingInvoiceHandlerTests
             Arg.Is("sub_123"),
             Arg.Is<SubscriptionUpdateOptions>(o =>
                 o.Items[0].Id == priceSubscriptionId &&
-                o.Items[0].Price == priceId));
+                o.Items[0].Price == priceId &&
+                o.ProrationBehavior == "none"));
 
         // Verify the updated invoice email was sent
         await _mailer.Received(1).SendEmail(