Merge pull request #102500 from latusekpiotr/patch-1

Note on Swap With Preview

Author: Court72

articles/app-service/deploy-staging-slots.md

@@ -146,6 +146,10 @@ When you perform a swap with preview, App Service performs the same [swap operat
 
 If you cancel the swap, App Service reapplies configuration elements to the source slot.
 
+> [!NOTE]
+> Swap with preview can't be used when one of the slots has site authentication enabled.
+> 
+
 To swap with preview:
 
 1. Follow the steps in [Swap deployment slots](#Swap) but select **Perform swap with preview**.