Many items in Echo of Soul are set such that they cannot be directly traded between characters, but can be put on sale on the Marketplace.
Some players use the Marketplace as a means of circumventing the restriction on trading, placing items up for sale at a very low price, and purchasing them with another character.
Players who engage in this practice do so at their own risk. Marketplace data does not always update at the same rate for all players, and other players who are aware of this practice are often checking the Marketplace for opportunities to take advantage of items at very low prices.
We understand that players' desire to move certain items between accounts can make risky behaviour feel worthwhile, and we are discussing alternatives. However, until any changes are made, we do not offer support for cases where attempted Marketplace transfers are intercepted.