diff --git a/src/Core/Constants.cs b/src/Core/Constants.cs
index e1ccbbd9b8..b732420e82 100644
--- a/src/Core/Constants.cs
+++ b/src/Core/Constants.cs
@@ -187,7 +187,6 @@ public static class FeatureFlagKeys
 
     /* Billing Team */
     public const string TrialPayment = "PM-8163-trial-payment";
-    public const string PM22415_TaxIDWarnings = "pm-22415-tax-id-warnings";
     public const string PM25379_UseNewOrganizationMetadataStructure = "pm-25379-use-new-organization-metadata-structure";
     public const string PM24996ImplementUpgradeFromFreeDialog = "pm-24996-implement-upgrade-from-free-dialog";
     public const string PM24032_NewNavigationPremiumUpgradeButton = "pm-24032-new-navigation-premium-upgrade-button";