we don't use the actual word "device"..it's just a placeholder for the sample. Our actual unique key is a hash of the real device id (which is a UUID) + the nam

we don't use the actual word "device"..it's just a placeholder for the sample. Our actual unique key is a hash of the real device id (which is a UUID) + the name. This means 2 users with the same name on different devices have, or 2 users with different names on the same device, are treated differently. The approach has worked well.