Error 240 fires when eBay's policy filter detects prohibited terms in the listing title or description. The listing is blocked until the offending text is removed.
eBay maintains a blocklist of trademarked terms, illegal item references, replicas/fakes language, weapons-related phrases, and adult terms. Innocuous-looking phrases ('Rolex-style', 'looks like Gucci') trigger the trademark filter. Words like 'replica' or 'knockoff' fail outright in many categories.