It seems like you’re trying to override a default parameter that Google Analytics 4 (GA4) automatically collects, which in this case is the ‘platform’. GA4 tries to automatically determine the platform (web, android, iOS) based on the data source. The ‘platform’ parameter you’re trying to set manually is a different one and does not influence GA4’s automatic tracking of the platform. For GA4 to accurately track the platform for a hybrid app, you’ll need to integrate GA4 SDKs for both web-based tracking (gtag.js) and for the respective mobile platforms (Android/iOS). Each has different setup instructions available in the GA4 help center. It’s important to send the appropriate data from each platform using the correct SDK to ensure accurate tracking.