Cached credentials are used to ensure that users have a way of logging into their device in the event that the device is unable to access the Active Directory. If the user is not connected to the corporate network, then their new password will not work because the old password is still stored in the cache. When a user changes or resets their password, the Specops uReset software automatically synchronizes the new password across the user’s devices, updating the local cache in the process. This means that a user should never run into a situation in which some devices have been updated with their new passwords while other devices continue to use the old passwords.
Source: https://thehackernews.com/2021/03/why-cached-credentials-can-cause.html