I can't access my Travel Bank funds to pay: period. I cannot see a Travel Bank button (panel) when I go to check out.

I have read through this thread assiduously and noted all of the things that make a ticket ineligible for Travel Bank. I tried to eliminate all of them from the ticket I was trying to purchase. That did not work. I tried two different laptops, one using Firefox, one using Chrome. That did not work. I do not use the app, but I got my son, who does, to go in "as me" and try to book. The Travel Bank option never showed up. (By the way, I was always logged into my account, and Travel Bank funds were visible on-line in the same sessions when I was trying to book.) After innumerable delays and dropped calls, I got someone at United to transfer me to web support. They went through everything with me to make sure that I was clicking as appropriate and not clicking as not appropriate. They were in the middle of taking it under advisement when that call eventually terminated.

Before calling again for a flight I want, I decided to reverse engineer and book as "vanilla" a flight as possible -- a simple round-trip in Economy from EWR to ORD and return. Surely that would be on UA metal. I did not opt for any bundles or anything else. I did choose seats, but not seats that required payment. (I also tried without choosing seats.) Same issue. I get to the place where they say that the Payment Options are being changed, and click on the link to go to the other alternatives, but the panel for Travel Certificates does not say Travel Certificates and Travel Bank, as I have seen in the screenshots of others.

So I'm reduced to thinking that is either/or (a) something "special" about me; (b) a browser issue I have still not fixed.

Experiences of others welcome. TIA.