Fitness challenges not syncing between iPhones with same iCloud account

Bronco4x4ever wrote:

Have new iPhone 16 since mid Jan. Keeping iPhone XS, both are on same iCloud acct. Monthly challenges were the same for Feb, different for March. 16 shows all challenges met, XS is not showing Feb or March challenges.

I carry the XS when outside exercising. Daily data updates to the 16 after a few days.

Tried syncing the phones, both are toggled “on” in health. How do I get the phones to show the same monthly challenges and completely sync them?

I do not have an Apple watch.

and your XS has cellular data connection while you're outside?