It is still not working
I just got off the phone with them and told them about my case (again). We went through the same basic troubleshooting (speedtest, forget wifi and add Wifi again, etc...) as before and as expected, same results. They want me to return the unit or try to get a replacement from Amazon. They even told me that I am the only customer that has ever had this problem
The VPN test I did earlier was maybe not conclusive as the VPN provider doesn't allow port forwarding. I see that the doorbell sends a UPNP request to my router to open up ports:
Protocol Port Internal IP Local Port Description
TCP 39467 192.168.1.34 9010 IPC_CMD
TCP 38549 192.168.1.34 9020 IPC_STREAM
UDP 31738 192.168.1.34 9030 IPC_UDP_STREAM0
UDP 39156 192.168.1.34 9031 IPC_UDP_STREAM1
UDP 35130 192.168.1.34 9032 IPC_UDP_STREAM2
UDP 38284 192.168.1.34 9033 IPC_UDP_STREAM3
Most likely these ports need to be open and forwarded to the camera, for it to work with the RCA app (or numerous other I have tested). So maybe Norway and Sweden are not supported. The technology isn't there yet!
I have the same stamp as you on my product box and my HSDB2A serial number is C9563477X.