Permission error attempting to add disk to vm

Do you have limited permissions to perform this operation ?

We don't have any problems adding a disk to any other virtual machine.

The logged in user is a member of the domain admins group and assigned the Administrator role.

Is it just this VM, can he create a VM, and add disks to it.

It is just a single vm that we cannot add disks to.  All other vms on the same host do not have this problem.  He can create a VM and add disks to it as well.

I can add disks through the vSphere client but not vCenter.  I tried to remove the host from vCenter and re-add it but it didn't help.

Okay, so it's vCenter permissions.

Is this all users, Domain Admins, Administrators or a single user ?

All users.  The user that is attempting to add the disk is a part of the domain admins group and it has also been attempted using the domain administrator account.

So, not a single user can add a disk to this VM?

If you do not have any strange permissions, I would create a new VM, and add the disks from the old VM to this new VM, very simple to do, because you have the existing configuration.

I only have the issue with a single vm on the host.  There are 3 other vm's on the same host that I have no problems adding a disk to.  The workaround has been to add the disk through the vSphere client instead of vCenter but I would certainly like to understand what the underlying cause is.  I suppose I would need to bring the vm down to add the disks to the new vm?