Artifact Signing identity validation failed - "provide additional documents" but no upload option in portal

Our organization identity validation for Artifact Signing failed with status "Validation Fail" and the message: "Please provide additional document(s) dated within the past 12 months to verify your organization." There is no option in the Azure portal to upload these documents, and technical support requires a paid support plan. Details: - Subscription ID: ac60d988-1d2a-4cdc-9d15-5f621582e9c4 - Artifact Signing account: westory-signing (East US) - Identity Validation ID: c6569773-4c0b-4bc9-930c-cab4610d15ce - Organization: TRUE STORY - Address: 301, 4 Gunja-ro 533beon-gil, Siheung-si, Gyeonggi-do 15068, South Korea - D-U-N-S: 696554615 We have a current official English Business Registration Certificate (issued within the past 12 months by the Korean National Tax Service) that matches the organization name and address exactly. How can we submit this document to complete the identity validation? Could a Microsoft engineer connect offline to collect it?