OCI Network Load Balancer cannot be deleted

Summary:

In my OCI account, I have a Network Load Balancer. This shows as "active", health status "OK", and has a public IP attached. I want to terminate it, but I cannot; the returned error is "Authorization failed or requested resource not found".

Since this is Free Tier, I can't open a support ticket and have been directed here.

What can be done to resolve this?

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