2a:T6d2,

{{formatUser "U072E3RCYPN" ""}} perhaps you can help. I found this article on unique users. While using event explorer and looking at my IP address and the available users to track, I'm seeing a new Amplitude ID for my device each time I open the app when not logged in. Shouldn't there only be one Amplitude ID given it's the same device each time? After I do login, I only see one Amplitude ID gets merged with the pre-existing UserID, rather than all of them.

When I lookup some of the unique Amplitude IDs that are from the same device, I can see they have unique device IDs, yet both are from the same device and same app version/install. Is there a configuration setup that would be generating a unique device ID each time a user opens the app when not logged in? I think this would explain why we're seeing such a huge number for our top of funnel reports.

In the above referenced article it states that Amplitude should pull the IDFV (Identity for vendors) ID for mobile applications (we have a react native app), but that doesn't seem to be the case given the device Id changes. An example of the device ID format I see: 30b6184c-a62b-464d-815e-7dc44e1ab5d2. I'm assuming this is the randomly generated UUID?

Ultimately I'd expect we'd use the user's device ID and it wouldn't matter how many times they opened or closed the app as long as they were using the same device (or even a new app update), and then we'd merge that single Amplitude ID with our User Id once the user registers. I suspect there's a configuration change we need to make, but just need to understand what it should be.

2b:T601, on unique users. While using event explorer and looking at my IP address and the available users to track, I'm seeing a new Amplitude ID for my device each time I open the app when not logged in. Shouldn't there only be one Amplitude ID given it's the same device each time? After I