Support got back to me today.
Mike, those paragraphs you posted are exactly what I was talking about. I did not see that on my arbitration day. It is possible I was expecting it on the main screen but even so I don't know how I would have missed that when I clicked the "arbitrate" button. I have been doing arbitration this way for 30 seasons, I don't know why it didn't work this one time.
Support's response is interesting though. "We're not sure what MikeT23 is seeing, but any long-term contracts must be completed before the start of arbitration hearings."
They don't even know their own game. They are wrong. I know they're wrong, we all know they're wrong. If they had just said the link is there and you had to have missed it, I would just as baffled but at least I could take comfort knowing the programmers of the product I pay for know their own code.