If the SecretStore Information dialog box in SecretStore Manager displays "Not Available" for the Last Admin Unlock Time Stamp setting, a SecretStore administrator has most likely never unlocked the user's SecretStore. SecretStore Manager has nothing to report.
SecretStore Manager can't display any information for the following situations:
If someone unlocks a user's SecretStore and then disables SecretStore Administrator access to SecretStore, SecretStore Manager nevertheless reports the time stamp and distinguished name of whoever unlocked the SecretStore.