TestFlight “What to Test” – Error processing request when submitting build for review

Hi,

I’m experiencing a server-side error in App Store Connect when trying to submit a TestFlight build for review.

Details:

• App: Ngoc Rong 2
• Platform: iOS
• Build status: Complete
• Distribution: External Testing
• App Store Connect Web (Safari / Chrome both tested)

Steps:

1. Go to TestFlight → Select build
2. Click “Submit for Review”
3. Fill in “What to Test”
4. Click Submit

Result: Popup shows: "There was an error processing your request. Please try again later."

Notes:

• Build processing completed successfully
• Internal testing works
• External group already created
• Issue happens consistently
• Tried different browsers and cleared cache
• Same issue across multiple builds

Is this a known App Store Connect issue? Is there any workaround? Additional information:

I have already contacted Apple Developer Support. Case ID: 102871190604

If needed, I can provide further details or logs.

Thank you.