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Restricted Namespace Identifiers in Rules



I have noticed this section when setting up a new tenant:, and are Auth0 domains and therefore cannot be used as a namespace identifier.

Unfortunately we have 3-4 older tenants which did exactly this and haven’t been modified in a number of months. These rules run fine, and if they broke it would kill our login. What will happen to those in the long term?

When was this restriction added?