November 2017
When I attempt to play any NHL18 game mode that is 1v1, I can never find an opponent. This has been happening for a few days, never had this issue before. I've tried online versus, online shootout, HUT seasons, and Draft Champions. The strange part is, I can play drop in and club games with no issues, and a flawless connection.
I attempted to search for other threads that had this issue, and I could only find that disabling IPv6 as a solution. I cannot seem to find how to do this, and I am unsure if this would effect anything negatively for any other online experiences.
November 2017
The IPv6/IPv4 changes may help, your ISP can assist with configuration of your router.
https://answers.ea.com/t5/Technical-Issues/CANNOT-FIND-OPPONENTS/m-p/6353453#M281