Port forwarding with Fritzbox as modem

Hello all, i am trying to forward a port (80) from internet to my IP cam. 

Here is my network scenario

I did forward port 80 in Fritzbox, that seems to work. I forward 4444 to Sophos for testing and it worked. I could open Sophos Webgui on public ip.

Here is my Firewall Rule:

actual tried with network Any instead of WAN but didn't work either.

Here my dnat rule

So what I have tried.

I tired to call my Ip address with port 80 and firewall log says:

Then I connected a device to Fritzbox and tried to open 192.168.155.2:80 and firewall says:

I tried so many settings like setting up snat or network masqerade. I did try even firewall rule any network using any port to any networks but that didn't work as well.

It drives me nuts.  Let me know if I missed information to share.

I do appreciate every help

thank you in advance

Simon