What causes DF-Github-WriteNotSupported?

A data flow sink was mistakenly configured to write to GitHub instead of reading from it. Copy/paste of an existing data flow reused a GitHub dataset in a sink position. A developer intended a different destination (e.g., Azure Blob, ADLS) but selected GitHub by mistake. Attempt to use GitHub as a lookup or staging destination, which is not supported

How do I fix DF-Github-WriteNotSupported?

Open the failing data flow in ADF Studio and inspect the Sink tab — confirm whether GitHub appears as a sink dataset.. Replace the GitHub sink with an appropriate writable destination such as Azure Data Lake Storage Gen2 or Azure Blob Storage.. If GitHub was intended as a source, move the GitHub dataset to a Source transformation instead of a Sink.. If you need to write output back to a Git repository, use a separate pipeline activity (e.g., Web activity or Azure Function) outside the data flow.. Save and re-publish the data flow, then trigger a new debug run to confirm the error is resolved.

Medium severitydata flow

Power BI Refresh Error:
DF-Github-WriteNotSupported

What does this error mean?

ADF Mapping Data Flows use GitHub as a read-only source connector — it does not support writing. If a data flow sink is configured to write to GitHub, the flow fails immediately.

Common causes

1A data flow sink was mistakenly configured to write to GitHub instead of reading from it
2Copy/paste of an existing data flow reused a GitHub dataset in a sink position
3A developer intended a different destination (e.g., Azure Blob, ADLS) but selected GitHub by mistake
4Attempt to use GitHub as a lookup or staging destination, which is not supported

How to fix it

1Open the failing data flow in ADF Studio and inspect the Sink tab — confirm whether GitHub appears as a sink dataset.
2Replace the GitHub sink with an appropriate writable destination such as Azure Data Lake Storage Gen2 or Azure Blob Storage.
3If GitHub was intended as a source, move the GitHub dataset to a Source transformation instead of a Sink.
4If you need to write output back to a Git repository, use a separate pipeline activity (e.g., Web activity or Azure Function) outside the data flow.
5Save and re-publish the data flow, then trigger a new debug run to confirm the error is resolved.

Frequently asked questions

Can GitHub ever be used as a sink in ADF?

No — GitHub is a source-only connector in ADF Mapping Data Flows. There is no workaround for writing to GitHub from a data flow sink. Use a writable connector (ADLS, Blob, SQL) for output.

How do I write pipeline output back to a Git repo if I need to?

Use a Web activity or Azure Function activity in the pipeline (outside the data flow) to call the GitHub API or a Git push command. Data flows cannot write to version control systems.

Will this error appear in debug mode too?

Yes — debug mode runs the same data flow logic and will also fail if a GitHub sink is configured. The error appears immediately when the Spark executor tries to write the first output batch.

How does this differ from a permissions error on GitHub?

A permissions error would surface if GitHub writing were theoretically possible but blocked — that is not the case here. DF-Github-WriteNotSupported means writing is architecturally not supported by the connector, regardless of credentials.

Official documentation: https://learn.microsoft.com/en-us/azure/data-factory/data-flow-troubleshoot-guide