The primary way of authorizing a user or group in vSphere is the vCenter Server permissions. Depending on the task you want to perform, you might require other authorization.

vSphere 6.0 and later allows privileged users to give other users permissions to perform tasks in the following ways. These approaches are, for the most part, mutually exclusive; however, you can assign use global permissions to authorize certain users for all solution, and local vCenter Server permissions to authorize other users for individual vCenter Server systems.
vCenter Server Permissions

The permission model for vCenter Server systems relies on assigning permissions to objects in the object hierarchy of that vCenter Server. Each permission gives one user or group a set of privileges, that is, a role for a selected object. For example, you can select an ESXi host and assign a role to a group of users to give those users the corresponding privileges on that host.

Global Permissions
Global permissions are applied to a global root object that spans solutions. For example, if both vCenter Server and vCenter Orchestrator are installed, you can give permissions to all objects in both object hierarchies using global permissions.
Global permissions are replicated across the vsphere.local domain. Global permissions do not provide authorization for services managed through vsphere.local groups. See Global Permissions.
Group Membership in vsphere.local Groups
The user administrator@vsphere.local can perform tasks that are associated with services included with the Platform Services Controller. In addition, members of a vsphere.local group can perform the corresponding task. For example, you can perform license management if you are a member of the LicenseService.Administrators group. See Groups in the vsphere.local Domain.
ESXi Local Host Permissions
If you are managing a standalone ESXi host that is not managed by a vCenter Server system, you can assign one of the predefined roles to users. See the vSphere Administration with the vSphere Client documentation.