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The “91471” you’re seeing is likely not a city, but a ZIP/postal code, hence it’s appearing as a number. Google Analytics attributes traffic to the location of the internet service provider (ISP), not the actual physical location of the individual accessing your application. It’s highly likely that the ISP is based in Germany, even if your users are not. The “91471” may also could be related to an anonymization of user data that Google Analytics applied, in compliance with data privacy regulations, like GDPR in Europe. That being said, precautionary measures like multi-factor authentication and password changes are always a good idea when any suspicion is raised. It would also be beneficial to further investigate on your server logs for any irregular login behavior.
