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Datamart Incremental Refresh - Loading data failed

I'm testing the incremental refresh feature with a Datamart and do not understand the resulting error. Below are the steps to reproduce my error.


The data source is a simple Excel workbook with 13 rows of data:


These are the incremental refresh settings:


After clicking "Save", the status window displays the "Wrapping things up" step for ~30 minutes:


After ~30 minutes, I receive this error message:



Someone posted a similar problem here, but the original poster mentioned they immediately received the error, whereas mine takes a while to appear. Any help would be appreciated! Thanks!


In case it's helpful to someone at Microsoft, here is the full text of the error message:



ErrorMessageLocal Sql execution failed. Message=A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.)


Activity ID: undefined
Request ID: undefined
Status code: 500
Error Code: InternalError
Batch ID: 6eacbe53-32b0-404f-ad8d-76210361b347@beed7de5-d729-41d9-b689-02077bd353be$2022-10-28T15:19:19.2533606Z@bd7344c6-58aa-4aed-937f-094c32b5f21f

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