Values.MasterSourceContains information about the administrator account and invitation.
type nonrec t = {accountId : AccountId.t option;The ID of the account used as the administrator account.
*)invitationId : String_.t option;The value used to validate the administrator account to the member account.
*)relationshipStatus : String_.t option;The status of the relationship between the administrator and member accounts.
*)invitedAt : String_.t option;The timestamp when the invitation was sent.
*)}