After creating a dedicated server, I(or any of my friends) cannot connect to the server without switching the online-mode to false but that does not let friends outside of the LAN join. When switched on, I receive an error stating "You need to authenticate to Xbox Live" and cannot connect to my own local server via my Xbox One.

Both IPv4 and IPv6 ports are forwarded, NAT types are open(checking through the Windows Xbox app and the Xbox One settings).