How to Enable Advanced Calendar Sync (Recurring Events Sync and Deduplication Prerequisite)
To enable SmartCloud Connect to synchronize recurring calendar items in Salesforce or activate the advanced event deduplication mechanism you need to ask your local Salesforce admin to request the “Advanced calendaring” feature to be enabled for your org. Please refer to this instruction to learn how to log a corresponding case with Salesforce Support. Once this feature is enabled for your org, all fields required for recurring events sync and advanced deduplication will be added to the Event object.
Previously, these fields could be set up manually in Salesforce settings, now they are only available with this Salesforce feature enabled.