Salesforce: Why are some Account, Lead, or Contact updates not being synced with the Ongoing sync?
If the Ongoing Sync is enabled, but the integration is not adding Users or Organization data in Zendesk when Accounts, Contacts, and Leads are created or updated in Salesforce, verify how these are created or updated. By default, the Ongoing sync cannot sync any information created from a Bulk, Batch, or Future job run by a 3rd party Salesforce integration (such as MailChimp).
If the information is not synced on creation or update, please ensure that the Ongoing sync is enabled.
For example, to verify Contacts/Leads:
To verify, visit the Zendesk tab in your Zendesk for Salesforce integration and select Go to Mappings under User and Organization Sync Settings:
Once in the User and Organization Sync Settings, verify that Enable Updates is set to Yes: