Hello,
Thanks for very nice information.
If router RUTX11 does have public IP 92.40.195.110 on your mobile wan interface, before any bridging or other configuration, this should do the trick:
To begin with, disable AutoAPN feature in RUTX11 mobile interface window and enter APN manually, which should get public IP address from the RUTX11 router.
This should allow AX11000 router to get public IP 92.40.195.110 on its WAN interface as well, instead of private IP, as it is currently visible in AX11000 WAN configuration window.
It would also allow to reach AX11000 web interface via public and configure working port forwarding rules if for additional firewall is blocking such connection.
In order for port forwarding rules to work, you might additionally need to disable windows defender firewall as per attached image.
These steps allowed me to create working port forwarding rules when bridge mode was enabled between RUTX11 and RUTxx, thus if port forward configuration is correct, it should also work in your case.
Thanks .