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I don't know what's going on as of recently in this beta-testing because I haven't been able to play much but I was able to access the multiplayer as some point over the last week. But as of lately, I haven't been able to.

I'd go to multiplayer, hit "join game", and it'd say "no sessions were found". So then I'd try "host game", and then it'd say that I "failed to host the game".

The single player runs perfectly fine at max settings and everything so I'm not sure what it may be related to.
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Maybe check your firewall to ensure the game is still allowed access to the net.