Data Pipeline Parameterization Fails When Using Workspace Variables in REST Activities — Any Workaro

Hi SavioFerraz, 

By worksapce variable do you mean variable libraries? 

I've not had any issues with them, but I am not using REST activities.  Have you tried making a pipeline parameter and setting that equal to the variable library? THat might bypass the REST activity needing to resolve it itself. 

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Hi SavioFerraz 

This looks like a limitation in the current preview of Variable Libraries.

Workspace variables work perfectly in SQL and Notebook activities because those activity types already support resolving @pipeline().libraryVariables.xxx at runtime.

However, the REST/Web activity doesn’t seem to evaluate library variables the same way. Instead, it treats the value as if it were a normal pipeline parameter, which is why you get the error:

Parameter '<workspaceVariableName>' not found.

I haven’t seen any official documentation that says REST activities fully support workspace variables, so for now I’d treat this as a preview gap rather than a misconfiguration on your side.

simple reliable workaround:

You can still use workspace variables—you just need one extra step:

1. Add the workspace variable to the pipeline from the Library variables pane.
2. Use a Set variable activity at the start of the pipeline to copy that value into a normal pipeline variable, for example:

varBaseUrl = @pipeline().libraryVariables.BaseUrl

In the REST activity, reference the pipeline variable instead:

@variables('varBaseUrl')

This avoids the error completely because the REST activity only sees a normal pipeline variable, which it can resolve.

Here is the similar issue to yours may help you:
https://community.fabric.microsoft.com/t5/Pipelines/Parameterized-connections-in-Data-pipelines/m-p/4654252

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Aala Ali

Pricing & Profitability Specialist | Data Analyst at Zain Telecom
Group Leader – Microsoft Sudan Fabric User Group

linked in profile: https://www.linkedin.com/in/aala-ali/

Hi SavioFerraz ,

Thanks for reaching out to Microsoft Fabric Community.
Just checking in regarding your question. Please let us know if the guidance shared by Aala_Ali and tayloramy helped in resolving your issue, or if you need any additional clarification on the workspace variable behavior in REST activities.
Thank you.