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This problem start ocurring today and we still couldn't fix it or find the source of the error.
There is no description of the problem even when we download the excel.
Some BIs that don't use de dataflow are working normally.
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I have tried to create a new dataflow with Access Database as the data source and refreshed it by manually and scheduled, both of them are refreshed successfully.
As I previous reply, have you tried to configure a gateway for it when creating this dataflow and refresh it.
If it still could be refreshed, perhaps you may wait or IT aproval to transfer or DB to SQL like your said.
In addition, due to the community limitation, you can create a support ticket here about this issue for further help if you have a Pro license and this issue is urgent for you.
Best Regards,
Community Support Team _ Yingjie Li