Re: [PC] "Unable to join session" error when joining friend's match or accepting friend's invite

Make sure you don't have networking issues by making sure ports are open for Garden warfare:

http://help.ea.com/en/article/online-ports-to-open-pvz-garden-warfare-pc/

also make sure ports for Origin is open:

http://help.ea.com/en/article/connection-issues-with-origin/