A credential change management platform may, from a time period T1 to T2: deny access by remote client devices that submit credentials other than the prior or new credentials and, as a result of the denial, increment a lock-out counter, and allow access by devices that submit either the prior or new credential. From T2 to T3, the platform may: deny access by devices that submit credentials other than the prior or new credential and, as a result of the denial, increment the lock-out counter, deny access by devices that submit the prior credential without incrementing the lock-out counter, and allow access by devices that submit the new credential. After T3, the platform may: deny access by devices that submit credentials other than the new credential and, as a result of the denial, increment the lock-out counter, and allow access by devices that submit the new credential.