Every time I put an item on a cart . Error code 9999 pop up.

Question

Every time I put an item on a cart. Error code 9999 pops up.

eburtonlab · Answer

@idxp9330

A Google AI search for "eBay error 9999 cart" turns up the following:

"eBay error code 9999 usually indicates a "rejected" action when adding items to the cart, often caused by having too many items (over 100) in your cart/saved for later, a technical glitch, or a seller restriction. Key solutions include clearing your cart, saving items for later, using "Buy It Now," or updating the app.

Common Fixes for Error 9999:

Clear Cart/Saved Items: The most common cause is a full cart or too many "Saved for Later" items. Clear both sections to under 100 items total.
Use "Buy It Now": Skip the cart entirely and use the "Buy It Now" button on the listing page to purchase directly.
Check Seller Blocks: The seller may have blocked you, or restricted buyer activity (e.g., if you are a new user or recently left neutral/negative feedback).
Try Another Platform: Use a different device, browser, or try adding the item via the eBay mobile app if you are on a desktop (or vice-versa).
Sign Out and Back In: Refresh your session to fix potential temporary glitches.
Check Item Availability: Ensure the item is still available and the seller hasn't gone on vacation. "