Hi @Appbakkers,
Welcome to Google Cloud Community!
There could be other Google Cloud projects or Android apps that may be using the same package name and fingerprint combination. You can try to check all the projects and apps that you have access to, or contact Google Cloud Support for assistance in locating where the combinations are being used. It is important to ensure that the package name and fingerprint combination is unique to your app to prevent any conflicts or issues.
Thanks
@christianpaula is contacting a Google Cloud support for this matter only possible with a paid customer care plan? I can't see any option to actually contact a technician to get this information.
I checked all the projects in google cloud (I have just one project) and all the apps in developer account (there are just 2 apps). There is no duplication in SHA1 + package name pair. How I can get help on this?