Well, I don’t think it is is connecting. The wireguard app on my iPhone says “connected”, but on the router side it doesn’t note a connected client in the wireguard server settings.
I have no access to either router or to the internet.
For Wireguard on your iPhone, check if you have these two lines. If yes then it means wireguard server can be reached. If not then it means the server cannot be reached at all.
So, for your issue, first we need to make sure on your AXT1800 you do not have vpn client enabled. Otherwise it is vpn cascading and have to upgrade to firmware 4.1.1.
If you only have vpn server enabled, then next thing is to check if your public IP address (which is the endpoint in wireguard config) is accessible and it is fixed. If it is dynamic you may need to use ddns.
In the WireGuard app in my phone, I do not have the two lines that you have highlighted. Please see screenshot below. So I believe the WireGuard client on my phone is not making successful connection?
On my AXT1800 Flint I DO have VPN client enabled and connected. I have firmware beta 4.1.0 r6 on the Flint. I do not see 4.1.1 available in the Downloads centre.
Just some update: checked remotely and turn out the Virgin Media router in modem-mode does not allow any port open to the down stream router. It could be bug or intentially, which is still not sure.
After I rebooted the ISP router, it came back with the same IP address and I don’t believe the issue was resolved. To rule out the possibility that the ISP router did not reboot successfully, I decided to hard reset the ISP router. This has returned a new IP address from the ISP. It is ready for you to remote back in now, if you have time?