If you use CleanLinks or another addon that cleans up URL parameters you'll have to restart the game (bug in the game) and retry with such addons disabled. Normally clicking that button launches a browser request to Patreon which then redirects back to localhost:8080 with the information to get it "into" the game, then the socket (connection...laymen term) closes and it progresses, but only if the information was valid. (Obviously after it says you can close it the game should have progressed. If it didn't then repeat and find out which addon for your browser is borking up. Remember, you need a fake Patreon account until I can find some time to bother skipping that part. I've got so many projects these days that I don't niggle on the small stuff like that.)