Unable to Resolve the error when using fabric workload to connect to Fabric for showing react app

Hi pillabhagavan,

Thank you for sharing the logs.

From the error message:

"SecurityValidationFailed"
"Extension package was blocked by malware scanner"

It looks like the Dev Gateway is starting up and authentication is working ("Interactive user AAD token received"), but the failure happens during extension package registration when Fabric tries to upload and validate the workload package.

This usually means the .nupkg extension package was flagged by Fabric's security scanning service and blocked from registration.

Please check:
That you’re using the latest Fabric Extensibility Toolkit and Dev Gateway components.
Whether any custom binaries, scripts, executables, or third-party dependencies have been added to the workload package.
The contents of the generated package (Org.HelloWorldWorkload.1.0.1.nupkg) to make sure it only includes the expected manifest, JSON, XML, and asset files.
If you’re using the default HelloWorld sample and still see this error, it might be a false positive from Fabric’s malware scanner.

Can you confirm:
If this is the unmodified HelloWorld sample or a custom workload?
The version of the Fabric Extensibility Toolkit you’re using?
If the issue happens every time you regenerate the package?

If the sample is unchanged and the problem continues, you may want to open a Microsoft support ticket and provide the request ID:

Create a Fabric and Power BI Support Ticket - Power BI | Microsoft Learn

Thank you.