I have this dataflow that worked perfectly fine, until today.
No changes have been made. It's pretty hard to find the cause since I got no explanation whatsover.
But some common reasons why a Dataflow would work one day and break the next include:
1. Your datasource currently has new records that don't pass the field validation (too long, does not fit in the number range etc)
2. Illegal characters were inserted
3. Lookup column is referencing records that no longer exist
4. Authentication issue - you are no longer able to access the datasource
All of these scenarios would cause the dataflow to error out. In your refresh history you should be able to access more specific error messages.
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