Update TOC.yml

Author: Justinha

articles/active-directory/authentication/TOC.yml

@@ -56,8 +56,6 @@
       href: concept-mfa-licensing.md
     - name: MFA for Office 365
       href: /office365/admin/security-and-compliance/set-up-multi-factor-authentication
-    - name: Operator assistance
-      href: concept-authentication-operator-assistance.md
     - name: FAQ
       href: multi-factor-authentication-faq.yml
     - name: Operator assistance