The possible reasons :
- Deleted user: The SID corresponds to a user account that was deleted from the system.
- Domain account: The SID belongs to a domain account, and local queries won’t retrieve it.
- Corrupted account: The user account might be corrupted or misconfigured.
- Local vs remote account: The SID is for an account that exists on a remote machine or is not part of the local system.
- System settings: System restrictions or policies prevent accessing certain user details.