At any time after you enter into a lower tier covered transaction with a person at a higher tier, you must provide immediate written notice to that person if you learn either that—
    
    
        
        (a) 
         You failed to disclose information earlier, as required by  § 1404.355; or
     
    
        
        (b) 
         Due to changed circumstances, you or any of the principals for the transaction now meet any of the criteria in  § 1404.355.