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400 Bad Request when Debugging a Data Factory Pipeline

Koen Verbeeck runs into a problem:

I recently had a new pipeline fail. It was actually a copy of an old pipeline where I had made some adjustments into as part of a database migration. When triggered during an execution run, it failed saying some expression could not be parsed. When I went into the pipeline and triggered a debug, it immediately failed with the following helpful error message:

Click through for the error message and how Koen was able to fix the issue.

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