How does this 'unknown command keys' error typically manifest in managed Redis services like AWS ElastiCache or Google Cloud Memorystore?

Managed Redis services like ElastiCache or Memorystore often disable or rename the `KEYS` command by default for security, stability, and performance reasons to ensure the health of their multi-tenant environments. When you try to run `KEYS`, you will receive this specific 'unknown command' error, signaling that it's blocked by the service provider's configuration. Users are expected to use `SCAN` or other provided tools for key enumeration.