I had the same issue and spent lots of time figuring it out. Here's what currently works for me: // data field data.relationships.localizations.data.0.id = 'EN' data.relationships.localizations.data.0.type = 'appClipAdvancedExperienceLocalizations' // included field included.0.id = 'EN' included.0.type = 'appClipAdvancedExperienceLocalizations' included.0.attributes.title = String included.0.attributes.subtitle = String included.0.attributes.language = EN

Any updates @natebrierhinge?

Any updates @Madiska ?

@Arxos have you had any issues with Apple creating placeholder experiences? This seems to be a good workaround but still I wonder what would Apple do if they detected this behavior.