A user equipment (UE) can operate to configure an application service to a network slice instance while preserving an application identity (ID) privacy. The UE receives network slice customer (NSC) Service ID from an NSC. A UE route selection policy (URSP) from a network slice provider (NSP), or network operator, includes the NSC Service ID in a traffic descriptor that associates a single network slice selection assistance information (S-NSSAI) with the NSC Service ID. The UE associates the application service to the network slice instance based on the NSC Service ID and the S-NSSAI.