Assigning Administrator role to AD Group and delete default administrator accoint from Vcenter

Hi

I  have  added AD group and assigned  Administrator  role  to  it.  I  want  to  delete  administrator  account  or  assign Read only  role  to  it.  But  by  executing  I  get  an  error.

When   I    assign  Administrator  role to  a  domain account ,  I  can change  role of  administrator  account to Read only.

The requested change cannot be completed because it could leave the system without full administrative

privileges for a user or group

Removing this access rule does not necessarily remove all user permissions. The user retains permissions defined at parents of this object

Thanks  & Regards

Prajyot K

pkatakdound@microclinic.in