Unable to Enable Zone Redundancy for Azure SQL Managed Instance in East US 2

Issue Summary

We are attempting to enable Zone Redundancy for our Azure SQL Managed Instance deployed in the East US 2 region. According to Microsoft documentation and the Azure region availability information, East US 2 supports Zone Redundant deployments for Azure SQL Managed Instance.

However, when we navigate to the configuration settings for our Managed Instance, the Zone Redundancy option is disabled and cannot be selected. We have verified that the instance is deployed in East US 2, but the portal does not allow us to enable this feature.

Request

Could anyone please help us determine:

1. Why the Zone Redundancy option is disabled for SQL Managed Instance.
2. Whether there are any prerequisites, configuration limitations, service tier restrictions, or subscription constraints preventing us from enabling the feature.
3. What steps are required to enable Zone Redundancy on the existing instance, or alternatively, whether a new deployment is required.