Extended regional availability for Private Link UDR Support

Private Endpoint support for User Defined Routes (UDRs) is now in public preview. This feature enhancement will provide you with the ability to apply custom routes to traffic destined to a private endpoint with a wider subnet range.  In order to leverage this feature, you will need to set a specific subnet level property, called PrivateEndpointNetworkPolicies, to Enabled. In addition to toggling this property, you will need to also register for the Microsoft.Network/AllowPrivateEndpointNSGfeature (note that registation time may take up to 15mins).

This feature is available in the following regions:

UsEast2Euap, UsCentralEuap, WestCentralUS, WestUS, WestUS2, EastUS, EastUS2, Asiaeast, Australiaeast, Japaneast, Canadacentral, Europenorth, Koreacentral, Brazilsouth, Uksouth, US South, US North, France Central

Managing Private Endpoint Network Policies.
Managing network policies for private endpoints - Azure Private Link | Microsoft Docs

Registering for feature:

CLI - az feature | Microsoft Docs

PS - Register-AzProviderFeature (Az.Resources) | Microsoft Docs

Overview of User Defined Routes.

Azure virtual network traffic routing | Microsoft Docs

How it Works.

Route network traffic - tutorial - Azure portal | Microsoft Docs

Create, change, or delete an Azure route table | Microsoft Docs

What is Private Link?

What is Azure Private Link? | Microsoft Docs