Subscribe link not working

Subscribe link not working

Hi, 

The 'add to/subscribe' link provided in the More details for my public calendar is not working, it's this link:
https://calendar.zoho.com/ical/799578c6bda5555ba78a060d457854ceeefdce3c2e67800dba60a7c9e908da414a64100d17cdc3bb/mailto

However my calendar embeds fine in my website.

Clicking the link doesn't work and also if I try to 'add by iCal URL' to my Google Calendar, Google says it is not a valid URL.

Also for some reason I don't have the 'Sync' option in my calendar settings so I don't have the option to 'sync with google or Outlook' - is there a reason for this?


Could you please let me know what could be wrong.


Thanks, 


Matt