So I understand that if two alike IP's are trying to connect to each other that nothing will happen. I checked the network config and we are designated separate IP addresses. I can join my friend in ANY other game than this.
I have opened my steam ports for both of us with separate profiles and configurations for the both of us
I have opened my UBISOFT ports likewise the same settings with both TDP and UDP.
I'm not sure what else you want me to do, honestly.