I was really pleased to see that Zwift now logs activity to Apple Health when using Zwift iOS. However, there appears to be a bug, at least in my setup.
If I compare my rides in Mobile Link with the data logged into Apple Health, then it appears that Zwift is recording the Active calories / 1000. E.g. this morning’s ride was supposed to be 420Kcal, but Zwift has logged to Apple Health as 0.42Kcal