Edit: The number next to my I literally cannot join any game, I have each of the exact version, exact mods, heck even exact DLCs, but all it says is “Failed to connect”, I’m new to Hoi4 multiplayer, my friend in fact joined the same server we were trying to join but he was able to join via the Refresh LAN and refresh Internet and gave me the code, yet I couldn’t join each one. Yes, we tried that too and it didn't work. Simply click any of the options below, and the server listing will instantly become boosted with the selected amount - You don't even have to own the A Java application to help to translate the localisation files of the Paradox games.
We even tried it we the base game, no mods, no dlc.
But you could also go and buy the Conquer Covid-19 bundle which has Europa Universalis IV and 41 other games, 23 (audio/e-)books and 2 pieces of creative software for less than the original EUIV price… Every time I open the app, the green wheel will turn and turn until it says 'Can't connect to NVIDIA' with a 'Retry' button that does nothing. It cost a little over $70 a month before talking about buying games or even dlc.