Please mind that Apple is not necessarily reading these community discussions.
Thus I have reported a “Problem” to Apple via their feedback and support portal:
Product Feedback - Apple
I kindly suggest that you do the same.
The more people report this issue, the more likely it will be to get our beloved limited edition challenges back again.
I have written:
Today is February 16, 2024, and I haven’t received the limited edition Chinese Lunar New Year Challenge 2024 (Year of the Dragon) or the Unity Challenge on the Apple Watch this February, which have been offered in previous years.
Only the Heart Month Challenge 2024 was active on February 14, which I successfully completed.
Apparently some other Apple customers have also noticed this problem, see here:
Limited edition challenges - Apple Community
Apple Watch limited edition challenge for… - Apple Community
Weder Mond Neujahr noch Unity für 2024 we… - Apple Community
I'm also not sure why Apple doesn't announce that these challenges will be discontinued or when and where they will be available.
I'm really hoping for an update, and to get these very important challenges back from Apple next year. Thanks!
The more people do the same, the more likely we are to get the attention we need. Regards, Axel