Unable to make "Account Type" as Required field on the Customer setup via Page Personalization

Summary:

We have a business requirement where we need to make Account type as a required field on Customer Account creation or edit page, this field is used to drive our SLA based on value("Internal" or "External")

We used a sandbox to mark the field as "required" which showed as true and even it is marked with the "*" to show it as mandatory.

Still it is continues to allow saving the customer account without account type

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