Update TOC.yml

Author: jeffpatt24

articles/storage/file-sync/TOC.yml

@@ -69,8 +69,10 @@
       href: ../files/files-manage-namespaces.md?toc=/azure/storage/file-sync/toc.json
     - name: Enable threat protection with Microsoft Defender for Storage
       href: ../common/azure-defender-storage-configure.md?toc=/azure/storage/file-sync/toc.json
-  - name: Encryption
+  - name: Security
     items:
+    - name: Configure managed identities (preview)
+      href: file-sync-managed-identities.md
     - name: Encryption at rest
       href: ../common/storage-service-encryption.md?toc=/azure/storage/file-sync/toc.json
     - name: Encryption at rest with customer-managed keys