The cooperation server has certain game features disabled, such as getting warfare tech. We recommend that you don't use the alpha ui for the Cooperation server. Also note the next from the original announcement:

"Possibility of bugs, missing or broken experiences
Because this is a beta, things may break or not work as designed so be careful if you’re playing a country you care about. If you’re worried about this, create a country on a server you don’t normally play on to test things out. Some features (like clan admin, standing orders, country search, etc) are not available yet as they are not complete. Any country abusing loopholes or bugs found on this UI will be subject to deletion and/or account bans."