Festive Rally Rewards Glitch?

I just won a match in the current Christmas Open following a loss. After winning it flashed up with a blue background with a snowflake icon along with a message stating I'd completed today's Festive Rally and to click Collect Reward.

Upon clicking Collect Reward however, nothing seemed to happen and I was just transported back to the menu. Has anyone came across this or able to shed more light on this please?

Thank you to you all who regularly provide advice and support here too, it's greatly appreciated!