eBay MC999 Notice: What to Check Before You Respond

MC999 is a notice code some sellers encounter tied to account or listing activity flagged for review. Because the underlying trigger varies, the most useful first step isn't drafting a response — it's establishing exactly what's being flagged.

That means checking recent account activity against the notice: recent listings, recent changes to account details, recent buyer disputes or returns, and any recent changes in selling volume or category. A notice that seems generic often has a specific, identifiable trigger once account activity is reviewed against the timing of the notice.

For the fuller explanation of what an MC999 notice means, how eBay's review process works around it, and how to structure a response, see MC999 notice: what it means and how to respond.