Looks like they split each region into two separate IP Addresses and depending on which server you connect to, are the games you will be able to see/join. I had this problem this morning with my two accounts being unable to see each other’s games. I logged off on both, restarted my computers, and then started the game on both computers again; this got both on the same server.
Edit: Found this Blue post on the Technical Support Forums;
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Hey all,
We’ve seen some reports of this happening and from what the devs say, it happens when we’re actively deploying something server-side like a fix, which is why it happens to several players in spikes when it happens. The issue will usually resolve itself if both friends restart the game client, unless the deployment is still actively happening. Alternately, you can wait for the deployment to finish and it’ll clear up on its own.
I know that this is not exactly optimal when queues are active, so here’s an alternate work around. Other players mention that temporarily removing each other from their friends list can work around this. To do this, you’d remove eachother from your friends list while the issue is happening, communicate elsewhere, and re add each other later when the issue clears up.
Either way the developers are working on needing these fixes to happen less often over time which should prevent the problem from popping up less often over time as well.