The network may require a browser sign-in or other captive-portal step before it permits ordinary internet traffic.
Why this happens
A device can join a wireless network before that network grants full internet access. Hotels and other managed venues often place an acceptance or sign-in page in front of ordinary traffic. A television app may not be able to display that page, so its connection attempt looks like a player failure even though the Wi-Fi icon is present. This is different from an expired streaming account or an unsupported video codec. The stage at which access stops matters.
Use the venue’s approved connection instructions for the device you have. If a browser login is required, complete it through a supported route without entering private IPTV credentials into the venue’s portal. Managed networks can also isolate devices or limit casting, which is a separate issue after internet access works. Cloudflare’s connection documentation notes captive-portal interactions as a special connectivity case; changing DNS or enabling a tunnel before the portal step may complicate diagnosis. Keep any existing network settings so they can be restored, and avoid bypassing the venue’s access rules.
A useful way to work through it
Confirm whether the venue requires a browser login before ordinary internet access.
Use its approved TV/streaming-device connection instructions.
Keep network-portal credentials separate from streaming-service login details.