No .entitlements file generated with widget extension

Did you add the specific app group to your widget extension target? Xcode should automatically create an entitlement file once you add your first capability in the "Signing & Capabilities" section.

If that's not working, then please submit a Feedback.

I just tried and nothing was generated

The .entitlements file, is generated at the root of the project directory and not in the target directory, that's why I didn't saw it.

In my case, I duplicated the previous target. It is considering the previous targets .entitlements file for new one too and New entitlements file is not created automatically. Then i went to Build settings -> Signing -> Code signing entitlements and removed the filename.
It makes your target to clear some capabilities. I added the required capabilities again. As soon as i added the capabilities, new .entitlements file is created at the root level of my project.

I had the same issue, i logged and nothing appeared.

My solution : Enable a Capability

• Open your project in Xcode and select your target.
• Go to the "Signing & Capabilities" tab.
• Click the "+" button to add a capability, such as "Background Modes" or "Push Notifications" (or anything)

And it will update capabilities and create file, then u can delete this new cap.