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Apparently, somebody who I added many years ago as Admin in my Dev Account created Identifiers in my account for his other projects. This person (software developer) has since gone out of business or has passed away. No response by email. I've removed him and one of his associates from my acct. Now I'm the only person in my acct as Acct Holder. I have no apps (yet) in my App Store, so there's nothing to delete first before deleting the App Identifiers as advised by Apple Tech Support. What else can I do to delete orphaned Identifiers and clean up my Apple Developer Account?