Anyone else having trouble completing event challenges?

I like that tiger icon listed as an event challenge reward! On the game’s intro screen, it says it’s unlocked by completing the Trial of the 30 mission in the campaign.

Last night I started and completed that mission (this is the third or so time I’ve done this—did it twice prior to the event beginning) but wasn’t given the reward, and the challenge wasn’t marked as completed for me.

Has anyone else been able to do this?