as per my limited understanding -
To connect an App Service to multiple Azure Storage Accounts in different regions, you can follow these steps:
Create a Virtual Network: If you haven't already, create a Virtual Network in Azure that spans both the North Europe and Australia East regions.
Create a VNet-to-VNet connection: Create a VNet-to-VNet connection between the Virtual Networks in the North Europe and Australia East regions. This will allow traffic to flow between the two Virtual Networks.
Create Service Endpoints: Create a Microsoft.Storage service endpoint for each Storage Account in the respective regions.
Allow traffic through VNet-to-VNet connection: In the network security group (NSG) associated with the Virtual Network in the North Europe region, allow traffic from the VNet-to-VNet connection to the Microsoft.Storage service endpoint for the Storage Account in the Australia East region.
Configure the App Service: In the App Service, add the connection string for the Storage Account in the Australia East region. The connection string should include the name of the Storage Account and the account key.
Test the configuration: Test the configuration by accessing data in both Storage Accounts from the App Service.
By following these steps, you should be able to connect your App Service to multiple Azure Storage Accounts in different regions. Note that the VNet-to-VNet connection and NSG configuration may vary depending on your specific network setup, but these steps should provide a general framework for connecting to multiple Storage Accounts.