Gaunlet reward?

Went to my homepage. It told me to click to get my Gauntlet reward.

I click on the button. Nothing happens. What is the reward and where is it?

It's an icon (i.e.., that circular image of a yeti / poro / shark / etc that pops up above your champions when your match first starts).

Assuming PC client: go to the Home menu, click on your current icon (top-left, next to your gold), and a menu should popup with all the default icons plus what you've unlocked / won.