It looks like Arabic is not supported by BetaBuildLocalizationCreateRequest
Is there any way to update this localization programmatically? If not, any timeline when it will be available?
The goal here is to add "What's New" notes automatically in CI
Cannot update Arabic via App Store Connect API
I'm afraid this is a bit out of my domain, but I'd suggest trying to add it anyway, and if this fails, please file a feedback request. If it succeeds, file a feedback request to ask that the list be updated.