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It should work with Steemconnect. Which browser are you using? Maybe it's not working because an old Javascript file is in your browser cache. So if that's the reason clearing the cache should help.
If that's not helping, what happens if you try to log in with Steemconnect?

That is strage.. I tried with brave mobile and safari so far and I get looped at the point where I type in the account name and posting key. The Browser starts the Log-In leading to the "grad permission" view before then redirect to the Log-In view - a perfect loop.

So you tested it mobile and it's working just fine for you?

OK - I got it. To play the game you need to use the general account pwd or at least the activation key! Now it works. That was the problem, the posting key is not enough.