Several of my members are getting server error on PC for 24 hours. (They can access the game via Mobile). They have tried Chrome and Edge, and continual server error. All tried the steps to fix the issue. Supports only answer is try Firefox. This seems to be a widespread issue that isn't being resolved.
You know you all are posting on a thread from the last time that says "Fixed" in the title, so no one from Inno is going to look at this. One of you needs to start a new bug thread.
But aside from that, the one or two times this happened to me in the past few years, all I had to do was fully close my browser, not just the game tab, and when I started the browser again, the problem was gone. And depending on browser, you may have to clear your cache also.