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It seems like you’re facing an unusual situation. Google Analytics 4 (GA4) showing a number instead of a city name might appear strange, but there could be possible explanations for it. A potential reason could be that the number you’re seeing is actually a ZIP code. In your case, this might indicate a small or less-populated town in Germany that isn’t registered with a recognizable city name in the analytics API, hence it’s showing the ZIP code. If you’re certain that no one from Germany should be accessing your application, the traffic could be from VPN users or perhaps bots running from German servers. Since you’ve already taken serious security measures, you could wait and see if the unusual data persists or cease after these changes. If it continues, it might be worth getting in touch with Google support or further investigating network logs and traffic sources to identify the cause.
