VMware recommends that all accounts used for the setup have the least amount of privileges needed for the operation. Following this recommendation you should create two accounts used by the vla-service: one for vCenter Server and another one for VMware vRealize Orchestrator. In this case follow the Create and configure a vCenter Server user (Inventory user) and Create and configure a user for vRealize Orchestrator.

Note: It is possible to use only one account for the setup. For this type of configuration please follow the Create and configure a single user for the whole setup (inventory user also used for vRO).