How do you get the Season 2020 - Flex Bronze Icon?
It was a ranked reward. Riot's description in the client reads: “This icon was earned by finishing Bronze in Flex Queue in Season 2020”
Is the Season 2020 - Flex Bronze Icon still available?
No. The Season 2020 - Flex Bronze Icon was a ranked reward. To earn it, you had to reach Bronze in Flex during Season 10 (2020). Riot does not hand out past ranked rewards again, so you cannot earn this icon anymore.
