Do you have any experience about RFQ? I use "Request for Quote" (RFQ) orders to trade bonds recently. However it seems Interactive Brokers have bugs. I encountered issues and errors 9 out of 10 times. I only got my order filled via RFQ system very few times. I sent RFQ requests. Then I received price quotes from a liquidity provider. I pressed "transmit" button to accept the offer. However the order did not execute. I either encountered errors, or the order was being held forever ("dark blue" status in Interactive Broker) Price quotes are supposed to be firm. I don't understand why my orders did not get filled. Have you used RFQ orders before? Did you get your orders filled successfully every time / most of the time? Thank you for your time and answer.
Have a look at this article: https://www.interactivebrokers.com/campus/trading-lessons/tws-order-routing-settings/ Depending on your settings, you will have different ways of filling your orders.