serie streaming in French

What is your country? Canada perhaps?

In Canada, this TV show is available as two separate Store items for each language, for each season. Check that you purchased the intended version.

Outlander, Season 6 on iTunes - Apple (CA)

Outlander, Saison 6 sur iTunes - Apple (CA)

Note the difference in description language, as well as season vs. saison.

If you purchased the wrong language edition accidentally, then ask the iTunes Store staff for assistance. They may be able to assist in undoing that purchase, so that you may get the intended version.

Hi Michele,

If you're experiencing an issue with finding languages we recommend reviewing the guidance listed here: Change subtitles or languages for videos in the Apple TV app or iTunes Store - Apple Support

Audio languages on Apple TV, smart TV, or streaming device

1. On a Siri Remote or Apple TV Remote, press the Play/Pause button while watching a video to bring up the playback controls. Or on a remote for a smart TV, streaming device, or game console, press the button that brings up the video timeline.

2. Use your Siri Remote or Apple TV Remote to swipe up and select the Audio button . Or use your smart TV, streaming device, or game console remote to navigate to the Audio button .

3. Choose the audio language that you want.

To change the default audio language in Settings, go to Settings > Video and Audio > Audio > Audio Language, then choose the language that you want.

Should the behavior persist please reach out to support in your region for additional assistance: Get Support

Regards.