I'm in TopKilla's competition and received a link to join a game. I went to the forum's via the app and entered both the hyperlink "click here" and the link. Subterfuge subsequently opened to the start-up screen: the one where it says Online Play and Tactical Puzzles. i clicked Online Play but there was no difference.

Try killing the app completely and reusing the link.

Someone suggested clearing the cache as a working solution too. If you're on android, check out the test build also: https://goo.gl/rW8knj