Account holders receiving the message "Could not value contract at this time" will be unable to successfully transmit an order for the product in question.
The basis for the rejection varies, however. The rejection message is related to an inability of our automated systems to accurately determine a value for the instrument based on real time data and credit management.
Some scenarios that can cause this type of rejection are outlined in the IBKR Knowledge Base article "TWS Message: could not value contract at this time."