Unable to play any online game modes; *STADIUMNAME_-1 error

Bro I have the same problem.. 

I have the same problem since yesterday nothing helps I'm trying to find out why something like this suddenly pops up when I've been playing since October and I've never had it like this, that every time I enter some online mode after showing the compositions it immediately disconnects me. Bloody annoying but they probably have some kind of failure again and I have to wait until they fix it.

Thanks for reporting this issue. Have you already tried deleting any corrupt files in EA SPORTS FC™
or even Personal Settings 1 after launching the game? Does it happen in all game modes? 

I deleted all possible corrupt file as guided by the attached website and personal settings 1 as well, but it has not fixed the issue. I have confirmed it not to work in seasons and co-op seasons which leads me to the assumption of all online gamemodes being bugged.

I did the same as you wrote and nothing helped. All online modes do not work only what works for squad battles. I deleted all settings and files written above and nothing helped. The problem is of course on the PC platform

commenting to push post higher, solution still required

It's not exactly fixed yet and it's unplayable