How would I enable this "delete domain permission"?To add to this, the delete domain permission is disabled for the superadmin group by default. You'll need to enable that permission first from the group manager.
I am so blind sometimes ... thank-you for your patienceIt was mentioned above.
Advanced > Group manager
Superadmin >permissions
Scroll or search for: domain_settings_delete
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Your superadmin account can now delete a domain in Advanced>Domains