Document parsing failed

1. Confirm whether the failed item belongs to Documents (Lite) or Documents (Excel); their processing flows differ.
2. Open the visible error or status detail and preserve the returned message.
3. Confirm that the original Document Library file still exists and is accessible.
4. Verify that the file is not empty, damaged, password-protected, or mislabeled with the wrong extension.
5. Use the retry or reparse action only when the current page provides it.

Do not assign a specific cause when the service returns only FAIL. Include the resource ID, document ID, filename, status, time, and returned error in a support request.