[Bug - Partner Center] "Unexpected error" when publishing extension update at Submit step

[dangtungg]

Describe the bug
When publishing an extension update through Partner Center, an unexpected error appears at the Submit step:

"We came across an unexpected error while trying to process your request. Please try again later"

All submission sections (Packages, Availability, Properties, Privacy, Store listings) are marked as valid/completed (green checkmarks), but the request still fails. Retrying later does not resolve the issue.

To Reproduce
Steps to reproduce the behavior:

1. Go to Partner Center → Edge extension → Extension overview
2. Complete all sections (Packages, Availability, Properties, Privacy, Store listings) — all show as valid
3. Go to the "Submit your extension" page
4. Click "Publish"
5. See error: "We came across an unexpected error while trying to process your request. Please try again later"

Expected behavior
The submission should be accepted and proceed to certification.

Screenshots

Desktop (please complete the following information):

• OS: Linux
• Browser: Microsoft Edge
• Version: 149.0.4022.52 (Official build) (64-bit)

Additional context

• Product ID: f3ab0522-25bd-4356-9e37-1c793646d2c4
• This is a version-only update; only the extension version was changed. Previous submissions were approved successfully.
• The most recent submission was rejected under policy 1.1.2 (title contained excessive descriptive text). The title has since been updated to "MarkView - Modern Markdown Viewer" to address that feedback.
• All submission sections are marked as valid before clicking Publish, so this appears to be a server-side processing error rather than a content/metadata issue.

[Rahul-Bauri]

Hi @dangtungg could you please provide the HAR file to help the engineering team investigate further with the issue and help with a resolution.

[dangtungg]

Hi @Rahul-Bauri!
The issue is still persist and I can't update the new version for my extension. I've uploaded the HAR file into the below link. Please help me investigate this issue:
https://drive.google.com/drive/folders/1iuGkbAWKgbQWHbWVxrYuPjBbC8bu3vhb

[Rahul-Bauri]

Hi @dangtungg I have shared the HAR file for further investigation to the engineering team, will update here once I get any updates from them or if we need additional details from you to help unblock you from this issue.