Understanding Error 90108: UIEE File Format Issues in Amazon Seller Central
In February 2026 Amazon sellers may see error 90108 when a bulk upload fails UIEE format validation. The feed is fully rejected if a CSV is sent as a UIEE‑XML or the wrong feed type (e.g., Inventory Loader vs Product Feed) is selected.
Overview
On February 2026, Amazon sellers uploading inventory or product feeds may encounter error 90108, which signals that the submitted file does not match the required UIEE (Universal Information Exchange Environment) format. The feed is rejected outright, halting any updates to listings, pricing, or stock until the format issue is corrected—making prompt resolution essential for sellers who rely on bulk uploads.
Key Points
- Error 90108 definition — Indicates the uploaded file fails UIEE format validation, preventing Amazon from processing the feed.
- Complete feed rejection — The system discards the entire submission; no partial rows are saved, so every product in the file remains unchanged.
- Typical cause: wrong file type — Uploading a flat‑file CSV when the feed type expects a UIEE‑structured XML, or vice‑versa, triggers the error.
- Feed type mismatch — Selecting “Inventory Loader” while providing a “Product Feed” template is a frequent trigger.
- Straightforward fix — Align the feed type dropdown with the actual file format, then resubmit the corrected file.
How Error 90108 Occurs
- Feed type selection — The seller chooses a feed category (e.g., Inventory Loader) in Seller Central or specifies a feed type parameter in the Selling Partner API. If the chosen type expects a UIEE‑encoded XML but the uploaded file is a plain CSV, the validation step flags a mismatch.
- Initial format validation — Amazon’s ingestion engine reads the file header, checks encoding (UTF‑8 vs. UTF‑16), and verifies required UIEE elements such as
<Message>,<OperationType>, and<MessageID>. A missing<Message>tag or an unexpected delimiter causes the engine to reject the file instantly. - Error response generation — Upon detecting any structural discrepancy, the system returns error 90108 to the seller’s account or API response, halting further processing before any product data is parsed.
Analysis & Recommendations
Why This Matters
Error 90108 stops the entire feed, leaving all product listings, prices, and stock unchanged until the file format matches the selected feed type. Sellers relying on bulk updates can experience days of lost inventory accuracy, potentially affecting sales and buy‑box eligibility.
Key Takeaways
- Error 90101 occurs when a CSV is uploaded for a UIEE‑XML feed or vice‑versa, as seen in February 2026 reports.
- The feed type dropdown (e.g., Inventory Loader vs Product Feed) must align with the file's extension and structure.
- Missing required UIEE tags like <Message> or using the wrong encoding (UTF‑8 vs UTF‑16) triggers immediate rejection.
- Amazon discards the whole submission; no rows are processed, so every product in the file remains unchanged.
Recommended Actions
- →In Seller Central go to Inventory > Add Products via Upload, verify the feed type dropdown matches your file (.txt flat file → Inventory Loader, .x...
- →For API users, check the feedType parameter in the Selling Partner API request matches the file content (e.g., POST_FEED_DOCUMENT for UIEE XML).
- →Download the latest UIEE template from Seller Central > Templates, confirm the header (<?xml version="1.0" encoding="UTF-8"?>) or column headings, ...
Comments
Join the discussion
Log in or create an account to share your thoughts on this update.
No comments yet. Be the first to share your thoughts!