Sync contacts between my devices
I have two iPhones (iPhone 11 Pro Max and XR), both on the same apple account and always connected to same wifi internet.
If I add new contact on the 11 Pro Max, it will NOT automatically sync the contact to the XR, but
if I add new contact on the XR, it will automatically sync it to the 11 Pro Max.
I think it should be a two-way; either of them can sync to each other at any time?
Can anyone help to resolve this?