Where is Top Secret's technical document TEC394405?
Release : 16.0
The technical document that the IBM documentation refers to was moved to the Mainframe Common Maintenance Procedures doc. It is written for setting up SMP/E Internet Service Retrieval for Broadcom maintenance, so keep in mind that obtaining the needed certificates will be different depending on the vendor.
Configure Top Secret Security: https://techdocs.broadcom.com/us/en/ca-mainframe-software/traditional-management/mainframe-common-maintenance-procedures/1-0/configure-ca-smp-e-internet-service-retrieval/configure-ca-top-secret-security.html
KB Article 9794: SMP/E Internet Service Retrieval for Shared and Non-shared Certificates in Top Secret can alternatively be used, but also be aware that the links for certificates are for obtaining Broadcom maintenance via SMP/E Internet Service Retrieval.