removing domain from admin to use it in workspace for organization creation

[myusername]

Hello

  I need to remove my domain that is listed under  admin.google.com in account --> domains --> manage domains  to be able to use that domain in cloud identity or work space. 

It attached my domain to a new admin account when I was trying to make an organization through my gmail account as my project is under gmail account as a "no organization" setup. 

So now I need to remove the domain so I can attach it  to a workspace so I can create the organization 

But I am not seeing the remove button when I go to admin --> account --> domains --> manage domains . I am following this - https://support.google.com/a/answer/183028

Can someone please help?

Thank You