BO2 Private Lobbies Not Working on Zombies

[Afract]

I am trying to play a private match with my friend on bo2 zombies and I created a private match and it works on multiplayer but when I follow the exact same steps it doesn't work for Zombies. Any fixes?

[Resxt]

Afract are you trying to host a DLC map in zombies? If yes are you both using the torrent or no?

[Afract]

Resxt We aren’t and now its not working on multiplayer either

[Afract]

Resxt Resxt I have UpnP enabled. All it says is Joining game session and then the message just goes away.
We tried connecting through the ip and port through the console too.

[Resxt]

Afract make sure you both have the latest Core version in the launcher (r2904) https://plutonium.pw/docs/update/
You could try to port forward manually instead.
Also make sure no firewall is blocking the connection on the host side.
Open the ports and allow the plutonium bootstrapper in the firewall, see the doc https://plutonium.pw/docs/custom-games/

[Afract]

Resxt We tried port forwarding manually and it still didnt work. As you can see with the screenshot below, the port is whitelisted in my router and there is no firewall blocking the connection.

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[Resxt]

Afract Make sure no firewall is blocking the connection and that you're both on latest version, you didn't mention that.
Also are you on the same network or different networks?