I was seeking to set a seat alert for a UA flight I'm taking. EF found it under Flight Availability Results. I then used the icon to find the Seat Map, but it gave me a notice:

"The requested information could not be retrieved or is not available. This is likely due to invalid input criteria or lack of access to the information from the airline. Please revise the search parameters and try again."

I also tried to do a Seat Alert from the menu, but that gave me the same error code.

I checked the UA website and I could find the seat map there.

What gives?