Sandbox refreshes carry over the container but no contents.
This means that the dataset won't be visible in the UI and will either error or not return meaningful results when queried. The resulting error is usually identified with the following stacktrace ID: (-919394781)
1. Replication and External Connectors will need to be run and scheduled
2. External Data jobs will need to be run
3. CSV-sourced datasets will need to be re-uploaded
4. Dataflows will need to be run and scheduled
5. Recipes will need to be run and scheduled
For detailed steps on how to re-populate the datasets after a sandbox refresh, please refer to this article:
Repopulate placeholder datasets created from deployment or sandbox refresh in CRM Analytics
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