"Off-quote" message typically means that the price you requested is not at that moment. This can happen for several reasons, such as:

Fast price changes:
In volatile market conditions, prices can change rapidly, and the price you requested may no longer be valid.

Low market activity:
When there is insufficient buying or selling activity, the price may not be available.

Technical issues:
Problems with the trading platform or your internet connection may also cause this message.

In essence, an "off-quote" message means that the requested price is unavailable at the time, and the order cannot be executed at that specific price.