Hey, that is a good question, @David0715. You may want to start by going to Settings > Apps > Bixby > Set as Default > Clear Defaults.
Once you have done this would you mind attempting the tap and hold action on your IconX to see if you are prompted on your phone? Thanks!
Be sure to click " ✓ Accept as Solution" when you find an answer that works for you.
That worked perfectly. Once the default was cleared and the tap and hold action was performed, I was then asked witch service I would like to set as default. Thank you!