Change the [LocalDomainServers] entry from Reader access to Editor with Delete on the CATALOG.NTF template.
Perform this step before the CATALOG task creates the CATALOG.NSF database, or have that task recreate the database after you've made the template change.
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The CATALOG task will automatically demote non-domain catalog servers back to Reader but leave servers set up as Domain Catalog servers at Editor.
This gives the Domain Catalog server the ability to allow its spokes to delete entries from the Domain Catalog when databases are removed from the spokes.