I had several subscription calendars on Mac which was entered in iCloud
and so synced to my iPhone.
No the subscription link changed.
I deleted the calenders, added new ones (and changed the name of the calenders).
I see the calender subscriptions (with the new name so it has to be the new) in iOS (iPhone).
So calenders are synced.
But, no entry is showing up in iOS Calender app
/syncing phone with iTunes
/switching iCloud for Calendar on iPhone off and than on again
Retrieving data ...