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While I can confirm this bug exists, I might have found a temporary workaround, while we wait for a fix. Start a new game as norse (I picked Haesteinn of Nantes), resign, then load your game. The button should come back.
This has slipped my attention. Sorry about that. It was easily reproduced though, so I've filed a report of the issue. But most likely, it won't make it for the 2.2.1 patch I'm afraid. As we're currently trying to wrap it up in order to put it live.