Definitely just wait until after the weekend until schedule change Saturday and its aftermath passes. Call early or middle of the week during normal business hours and you have the best chance of getting a good (or at least better) agent. It could’ve been just the chat agent not knowing what they were doing (most likely) or they might not have seen the routing in their system yet. It also could be a married segment issue, which CAN be overridden for already existing itineraries. Some agents don’t know this, and I have had to politely escalate to supervisors to get my originally booked route back when the computer made a mess of it. It is worth noting that if this is indeed the case, keep a close eye on your itinerary during future schedule changes to make sure the computer doesn’t kick you out the routing again. I’ve had it happen 3 or 4 times in a row before it finally stuck.