I have a link on a website to let users add an ICS feed to their google Calendar. Using this code:

http://www.google.com/calendar/render?cid=https://<etc>

It worked for 3-4 years but not anymore. The message Google sends me is:

This email address isn't associated with an active Google Calendar account: https://<etc>

If I enter the ics feed manually things work ok: the feed is parsed as should. No errors.

Any idea where to look to fix this?

google-calendar-api
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