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Problem: An error message indicating the failure to synchronize internal domains in scheduled user data synchronization for Gmail.
The possible reason is as follows:
This occurs if your organization started to use the Gmail protection functionality in public preview. During that stage, Cloud Email and Collaboration Protection was not granted the domain read-only permission during access grant, and thus not able to synchronize the internal domains of your organization.
Perform either of the following:
  • Remove the Gmail service account that you used in public preview, and grant Cloud Email and Collaboration Protection access to Gmail again.
  • Go to Advanced Threat Protection → Internal Domains or Administration → Global Settings → Internal Domains to manually add the internal domains of your organization. Repeat this every time there is a new domain created for your organization.