If you receive that message when trying to tender funds onto a gift card, the issue is a self-imposed dollar amount restriction that each client setups up with Paymentech. In my example, the client requested that only $5-100 amounts could be put onto a gift card, so we received the error when we tried to test putting $1 on the card.
That restriction can only be changed by the client contacting their Paymentech rep.
In answerbook.