Weird Ranking System Requirements

So i wanted to play some flex with friends. And i just finished duoing in flex with a friend and we had someone else join. Unranked and never touched flex ranked. And his solo rank was silver and we weren't able to play flex like. MHH why? anyone know the requirements?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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