Admin locked out due to 2SV

Problem

An administrator is not able to access the Admin console, as they are not able to proceed with the 2-step verification.

Solution

For direct Google account: 
  1.  Please access Google Toolbox recovery form. 
  2.  It will request to create a record to verify the domain's ownership
  3.  An email with a confirmation will be received, follow the instructions on the email to recover the access.
For reseller account:
  1. Please contact the reseller as they can access to the Admin console to grant access to it. 

Cause

Not able to validate the 2-step verification when accessing to the admin's account.