Test another device
If multiple devices have the same problem, the connection or router may be the common point.
Check provider status
An ISP outage can leave the home Wi-Fi network active while external access is unavailable.
Avoid changing security settings unnecessarily
Do not weaken Wi-Fi security or reset equipment simply because one website is unavailable.
Escalate with observations
Provider support is more useful when you can say which devices work, which do not and whether wired/other connections are affected.
General consumer technology information only. Interfaces and menu names change. Before resets, reinstalls, storage changes or other major actions, verify that important data is backed up and use current manufacturer/service-provider instructions.