This is a known error with the Advocate network.
Here’s the fix; origin library > TF|2 > settings > game properties > launch options and type this in exactly +communities_enabled 0
Steam users can do the same, steam has a launch options property. For EA desktop app users however, it's a bit more complicated. Since it's still in "Beta" the command line feature has been disabled. To use it, you have to jump through some hoops, and the article linked here can help.
This command will reset your network, bypassing the bug
Alternatively, get the northstar client. It's 100% community hosted, ddos free and has custom gamemodes, mods, skins and more.
Hope this helps
[posting the forum link here as well, in case: https://answers.ea.com/t5/Bug-Reports-Technical-Issues/How-I-add-command-line-in-game-launch-option-... ]
