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Announcing the General Availability of New Availability Zone Features for Azure App Service

jordanselig

Microsoft

May 17, 2025

We are excited to announce the General Availability (GA) of the new Availability Zone features for Azure App Service. This update brings enhanced reliability and resilience to your applications, increased cost efficiency, and simplified management of your App Service deployments.

What are Availability Zones? Availability Zones, or zone redundancy, refers to the deployment of applications across multiple availability zones within an Azure region. Each availability zone cons...

Updated May 21, 2025

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joebartlett_qnrl

Copper Contributor

Jul 17, 2025

I've just tried to configure an App Service Plan to use 2 instances with Zone Redundancy enabled, but get the error:

App Service Plans with fewer than 3 workers are not allowed for zone redundancy. Requested number of workers: 2.

The same error occurs whether I try to configure this in the GUI or using the Azure CLI (using the command in https://learn.microsoft.com/en-us/azure/reliability/reliability-app-service?tabs=azurecli&pivots=premium#configure-availability-zone-support)

This is a Linux, P0v3 App Service Plan, running in the UK South region.

Is this just a case that I need to wait for the feature to roll out and try again? Or some other limitation? Thanks.

jordanselig
Microsoft
Aug 12, 2025
The issue should be resolved as of yesterday. Please try again and let us know if any issues.
jordanselig
Microsoft
Aug 04, 2025
Apologies for the delay, we are investigating this issue. 2 instances should be supported and there are no plans to go back to the 3-instance requirement. I will follow up when I have more information.