Birthday meta data not sync

In Gamipress>Settings>Add-on>Birthday, I have selected “User Meta” as the source of birthday data. And in User meta key field, I copy-pasted the meta key from the birthday field of Ultimate Member profile. But the data seems like not syncing up and the user is not awarded with points on their birthday.

Appreciate if you can let me know how I can make it work. Thanks for your help.