Error 403 often indicates an "Invalid Request" or "Access Denied," which can happen if Netflix thinks you are using a proxy or VPN. Disable VPNs:
But now she understood. The “NW” wasn’t “network.” netflix nw-6-403
: Older Smart TVs (such as some Vizio models) may no longer support the latest Netflix security updates. Error 403 often indicates an "Invalid Request" or