Newly bought iPhone 13 Not Activating

I've bought two iPhones recently from Amazon. One of them got activated very quickly and its warranty details are available on the Service and Support Coverage Website. Whereas for the other phone, it's not even activating even after I've started using it, by moving data from my previous device and even installing some other apps.

It's always showing this error when I check the details Service and Support Coverage Website.

Please activate your device

We’re unable to display coverage details because your device hasn’t been registered. Please contact your Apple product retailer or your wireless carrier to register this device.

Attaching the screenshots of both the devices.