Getting this error when new user login on Vcenter - unable to login because you do not have permission on any vcenter server systems connected to this client.
I think I need to add that user into some group. But I am not getting this option.
You will need to assign a role to the user. This can be done by going to menu > Administration > Global Permissions. Then assign the role that the users requires. If you want to restrict the access you can create your own custom role and assignment.
If you have a vCenter integrated with Active Directory you can create AD groups and assign roles against that so it will be easier than apply roles individually to different users.