Variable Library - "Can't Complete Action"

Hi Data_Ddraig 

Thank you for contacting the Microsoft Fabric Community Forum.

The error message “Can’t complete action. Check the technical details for more information and try again” typically indicates a failure in executing the request, often due to a backend service or API issue. Even when workspace permissions appear correct, edits can still fail if there is a mismatch between workspace-level access and tenant-level configurations.
 

Since Variable Libraries are a preview feature, one common cause is that the tenant setting may have been disabled by your Fabric or Power BI administrator. In such cases, workspace Admins can still view the Variable Library but are unable to make changes. To confirm, ask your Fabric tenant admin to verify the setting under: Admin portal → Tenant settings → Fabric (Data Factory) → Variable library (preview), and ensure it is enabled for your group or organization.
 

Another important factor to check is whether the workspace is connected to a Git repository. When Git integration is enabled, certain items become read-only in the service, and Variable Libraries fall under this restriction. In such cases, switch the workspace to Live mode to perform edits, and then reconnect Git afterward.

For more detailed information please refer to the official microsoft documentation on Get started with Variable libraries , Learn how to use Variable libraries - Microsoft Fabric | Microsoft LearnAnd The Microsoft Fabric Variable library permissions - Microsoft Fabric | Microsoft Learn

I hope this information is helpful. . If you have any further questions, please let us know. we can assist you further.

Regards,
Microsoft Fabric Community Support Team.