How to change the default language for the App Store Connect and the Google Play Console?

Question

In my Flutter project, I'm using Fastlane to deploy my app:

• on the App Store Connect using the deliver command
• on the Google Play Console using the supply command.

My app is currently available in French only (fr-FR) but now I made it available in both French and English (en-US).

I setup all my metadata for both iOS and Android so I get all the texts and screenshots available in both French and English, but I'm stuck with one last problem: How to set English as the default language for both stores for users whose devices are set neither in French nor in English?

The documentation for both deliver and supply (especially supply) is not clear for me.

EDIT : I can easily change the default language manually in the Google Play Store so it's no longer a problem. But I'm still stuck with Apple that doesn't allow me to even change the default language manually in the App Store Connect...

EDIT 2 : I also tried the following command: fastlane run produce language:"English", but it has no effect, I got the answer: App 'com.myapp' already exists (1666123456), nothing to do on App Store Connect

Thanks.

Answer 1

Here is the solution for the App Store Connect:

• click on "Add a new version" at the top left
• update the primary language and save

After that, I was still able to run my CI (using Fastlane) with the same version number I entered in the first step.