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I noticed that the problem can be solved by scaling down the privacy in the browser settings.
In my add-ons setting in Firefox, I had the DuckDuckGo Privacy Essentials (which automatically block hidden third-party trackers etc. for your privacy on the internet) turned OFF - and I was able to log in again on the KING website. Never had any problems before though.
The Brave browser blocks privacy attacks automatically, without having an add-on or extension installed. I haven't figured out what setting to use there.
Seems like KING doesn't care for our privacy on the internet. If your privacy on the internet is important, keep the privacy setting you use, but to log in to KING is no longer possible then.
Quote @sabbatha I could check the article but usually firefox support isn't that helpful.
If you find that you can't log in to a website that requires a username and password, follow the steps described in this article.
The article I linked starts off with the words shown above. Seemed quite pertinet to your problem I thought. The article is quite indepth.