Activate Google Synchronization, create on OE a recurrent event (no allday) synchronize the calendar, then delete an event of the recursion on OE, sync again on OE. An error will popup in the console. There is a typo in the variable sent to the google API. https://developers.google.com/calendar/v3/reference/events closes odoo/odoo#40625 X-original-commit: 299bb8a995fb8058bbc0b9e4d71b67d3e765c6af Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>