Issue with start devGateway ( info: DevGateway stopped. Stopping application)

Hi kanagarajs,

Thank you for reaching out and providing detailed information regarding the issue you are facing with DevGateway in Microsoft Fabric.

Based on the error message you're encountering: "errorCode":"FeatureNotAvailable","message":"The feature is not available"

It appears that, although the required tenant settings (such as “Workspace admins can develop partner workloads” and “Fabric Developer Mode”) are enabled, your tenant might not yet be fully enrolled in the Microsoft Fabric Developer Mode preview program. Go through the below links for better information:
Developer admin settings - Microsoft Fabric | Microsoft Learn
Set up your Microsoft Fabric development environment - Microsoft Fabric | Microsoft Learn

The error you are seeing, "FeatureNotAvailable", means your tenant is not fully enabled for Microsoft Fabric Developer Preview, despite having the correct tenant settings enabled. You need to ensure your organization has opted into the preview via https://aka.ms/FabricDeveloperMode, and if you have already done this, please contact Microsoft support to verify your tenant has the correct backend flags enabled.

If your tenant has already been registered and you are still receiving the same error after 24 hours, we recommend contacting Microsoft Support to:

• Confirm that the tenant is correctly flagged for Developer Mode backend access.
• Check if there are any internal policy or licensing constraints.

How to create a Fabric and Power BI Support ticket - Power BI | Microsoft Learn

Hope this helps clarify things and let me know what you find after giving these steps a try happy to help you investigate this further.

Thank you for using the Microsoft Fabric Community Forum.