The problem is simple where Google Other calendars (calendar where you can read-only) do not appear when you sync to iCloud devices via CalDav.
How to solve it?
- Step 1: Go to https://calendar.google.com/calendar/syncselect
- Step 2: Select all shared calendar you want to sync in icloud devices.
- Step 3: Save and it’s ready. Re-sync / refresh your Google accounts in iDevices to see those calendars appear! So cool!
Wish you a nice week.