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Why can't I delete my DNS Services instance?

Why can't I delete my DNS Services instance?

You attempted to delete your DNS Services instance, but received an error.

You received an error when you tried to delete your DNS Services instance. It might be for the following reason.

A permitted network is still in the zone

To delete a service instance, you must first remove all permitted networks from zones within the service instance.

Remove all permitted networks in the zone's instance again.