"You are guaranteed one of your selected roles"
I see this message when I am in promos. I was queuing for bot/mid at the time, and during my promos I played 2 games, 1 bot & 1 mid. So I found it to be an odd message, because on that account I had never NOT received one of my 2 roles. I always got bot or mid, whether in promos or not.
Now I played on my main account for the first time in almost a year, and the first game I got put in as support. Now it's possible I made a mistake, but I was pretty sure I queued with a bot/mid preference, which brings me to my questions.
Is it possible to actually not get one of your selected roles? Can you queue bot/mid and get put into a game as a support? I was under the impression you always got one of your selected roles, so I don't quite understand what that message means.