Hi,
According to your description, the connectivity works. The issue arises only when using TIA portal software.
According to information on the web, it seems that TIA portal works on layer 2 of the OSI model. What this means is that if you wish to reach your KTP panel remotely via VPN using TIA portal software, you will need to use a VPN which is capable to operate at layer 2. For example, OpenVPN in TAP mode.
Unfortunately, the RMS VPN Hub does not support TAP mode currently, so you will not be able to reach your Panel via TIA portal using RMS VPN Hubs.
Also, it seems that you need to select an adapter to use when connecting to your KTP panel. When you are trying to connect via Wi-Fi, you need to select the Wi-Fi adapter in TIA portal settings.
I have never used TIA Portal and it is not Teltonika's product, so I cannot really help you with this case. I will send you a private message though.
Kind Regards,
Andzej