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I've begun a Karl Franz Campaign with patch 2.2 and it seems the Imperial Authority confederation system is bugged.
I managed to confederate Talabecland on turn 22, but it was the only one. Since then I managed to get both Stirland and Solland to 10 fealty and received no confederation offers at all. I'm not under the confederation penalty since it's turn 45 by now and my last and only confederation was Talabecland.