adding rec to onboard to Defender

Author: batamig

articles/sentinel/quickstart-onboard.md

@@ -63,6 +63,11 @@ To get started, add Microsoft Sentinel to an existing workspace or create a new
 
 1. Select **Add**.
 
+> [!TIP]
+> We recommend onboarding your workspace to the Defender portal for a unified experience in managing security operations (SecOps) across both Microsoft Sentinel and other Microsoft security services.
+>
+> If you decide to onboard your workspace now, you can continue the procedures in this article from the Defender portal. For more information, see [Onboard Microsoft Sentinel to the Defender portal](https://learn.microsoft.com/en-us/unified-secops-platform/microsoft-sentinel-onboard).
+
 ## Install a solution from the content hub
 
 The content hub in Microsoft Sentinel is the centralized location to discover and manage out-of-the-box content including data connectors. For this quickstart, install the solution for Azure Activity.