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Hey @Pranjal Rajawat GA4 automatically tracks different sub domains as one session from the user, but considering you have setup 2 containers… you could have the same GA4 tag setup for both sub domains and add both of them in data streams for that GA4 property- https://www.analyticsmania.com/post/cross-domain-tracking-in-google-analytics-4/

+1 @samyak. Adding both web and app data streams in the same GA4 property would help