Hello GraphAKS,
Thank you for reaching out to Apple Support Communities.
You might have been watching something hosted by another provider. The Apple TV app allows you to add and view multiple providers.
"Connect apps and add your TV provider to the Apple TV app on iPhone
With the Apple TV app, you can watch shows and movies from streaming services and cable and satellite providers. The Apple TV app is on your iPhone, iPad, Mac, Apple TV, and supported smart TVs and streaming devices, so you can watch at home or wherever you go.
Note: The availability of the Apple TV app and its features and services (such as Apple TV+, Apple TV channels, sports, and supported apps) varies by country or region. See the Apple Support articles Availability of Apple Media Services and Availability of supported apps in the Apple TV app.
Connect video streaming apps
The Apple TV app recommends new content or the next episode in a series you watch from a connected app (supported streaming apps only). Connected apps appear in the Apple TV app on all your devices where you’re signed in with your Apple ID.
To connect or disconnect supported streaming apps, do the following:
- Tap Watch Now, then tap your picture or initials at the top right.
- Tap Connected Apps."
Additional details can be found here: Connect apps and add your TV provider to the Apple TV app on iPhone
Some third party providers may charge a separate subscription or charge you for content.
Hopefully this helps.
Cheers!