How to forward ports on TL-ER6020?

Question

network hardware

There was a need to connect the TL-ER6020 set-top box to work with two providers, in case one falls off. The local network is working, inside the office everything is functioning normally. There is a local server IP 192.168.0.110, it is necessary to implement access outside the office, that is, from the Internet.
I also determined and fixed the local IPs for the server 192.168.0.110.
I tried to forward ports through Transmission -> NAT -> Virtual Servers

As a result, when I go through the external IP = the page is not available.
Instructions that I used:
https://www.tp-link.com/us/support/faq/2132/ - Did not help
https://www.tp-link.com/ru/support/faq/2026/ - Did not help

Answer 1

It's all the fault of the "gray" IP, they connected the static IP service from the provider. Everything worked!

Answer 2

In addition to the comment above, it would be nice to switch the router's face to a non-80th port (either allow connections from outside, or disable the web face altogether). The router can block such connections not from the local area