Add graph.microsoft.com to online documentation

https://msazure.visualstudio.com/Intune/_workitems/edit/15587071

Author: OluchiC

memdocs/intune/protect/microsoft-tunnel-prerequisites.md

@@ -236,7 +236,8 @@ When creating the Server configuration for the tunnel, you can specify a differe
   - `*.blob.storage.azure.net`
 
 
-- The Tunnel shares the same requirements as [Network endpoints for Microsoft Intune](../fundamentals/intune-endpoints.md), with the addition of port TCP 22.
+
+- The Tunnel shares the same requirements as [Network endpoints for Microsoft Intune](../fundamentals/intune-endpoints.md), with the addition of port TCP 22, and graph.microsoft.com.
 
 - Configure firewall rules to support the configurations detailed in  [Microsoft Container Registry (MCR) Client Firewall Rules Configuration](https://github.com/microsoft/containerregistry/blob/master/client-firewall-rules.md).