Step 1. Check Veeam ONE Security Group Membership
Check that the user is not included in Veeam ONE security groups (Veeam ONE Administrators or Veeam ONE Read-Only Users). Otherwise, the user will be granted access to the whole infrastructure inventory in Veeam ONE, including VMware vSphere, vCloud Director, Microsoft Hyper-V and Veeam Backup & Replication.
For details, see Permissions and Security Groups.