Every organization registered to use any Mithi product is identified with the id used to sign up for the first SkyConnect/Vaultastic domain or the first LegacyFlo or Ideolve account.
Once this is assigned to an organization, it cannot be changed. And it will be shown in the license details.
However, there will be no communication or alerts sent to this id, unless it is also one of the contacts defined using the Mithi Account.