How do I fix ADF Pipeline Error 2355?

Open the failing ADF activity (Custom/HDInsight/Batch) and locate the commandEnvironment property in the JSON definition.. Ensure the value is a JSON array of strings, each shaped as "variableName=variableValue" (e.g. ["ENV=prod", "REGION=westeu"]).. Verify that each variable name appears in the list only once — remove duplicates.. Remove any entries with empty names/values or missing '=' separators, then republish the pipeline.. Re-run the pipeline and confirm the activity starts past the validation phase.

High severityconfigurationAzure Data Factory →

ADF Pipeline Error:
ADF Pipeline Error 2355

What does this error mean?

The value provided for commandEnvironment is incorrect — expected an array of CmdEnvVarName=CmdEnvVarValue strings.

Common causes

1commandEnvironment is not an array of strings (e.g. passed as object or single string)
2Entries missing the '=' separator between variable name and value
3Duplicate variable names in the commandEnvironment list
4Empty variable name or value, or stray quotes/whitespace breaking the NAME=VALUE format

How to fix it

1Open the failing ADF activity (Custom/HDInsight/Batch) and locate the commandEnvironment property in the JSON definition.
2Ensure the value is a JSON array of strings, each shaped as "variableName=variableValue" (e.g. ["ENV=prod", "REGION=westeu"]).
3Verify that each variable name appears in the list only once — remove duplicates.
4Remove any entries with empty names/values or missing '=' separators, then republish the pipeline.
5Re-run the pipeline and confirm the activity starts past the validation phase.

Frequently asked questions

What causes ADF Pipeline Error 2355?

Pipeline configuration or connectivity issue

Where can I find more details?

Open Azure Data Factory Monitor, find the failed run, click on the activity, and view the full error output in the Output tab.

Source · learn.microsoft.com/en-us/azure/data-factory/data-factory-troubleshoot-guide#error-code-2355