There's a bug or problem with the Discord part (extension or all discord related plugins) Discord core is one of them, also DiscordPlayers - all buttons are not working and give interaction failed on any button when clicked. No idea what's wrong but that's it, Reloaded the plugin, players still can't link their accounts.

I found the same issue. Then I looked at my config, and it had gone back to default. Nothing was maintained when it was working, so I had to add it all again.

Sorry, I forgot to update this post... It was problem with the extension (at leats for me) and reconnecting it with the de.websocket.reset command fixed everything. My config was good and not back to default.