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Sync Calendar with MacOS Calendar

Former Member
Former Member
Hello,
For over a few years I'm syncing my GC calendar with MacOS Calendar. Great! But since April 4th 2018 sync does not work anymore. Error message: The downloaded data from https://connect.garmin.com/modern/proxy/calendar-service/export/51............... is not valid. My calendar in GC is public and I renewed the link in Calendar of the Mac.
Does anyone know what can be the cause of this problem. (MacOS Sierra 10.12.6)

Thanks on behalve...

Martin