Not sure if I'm being a bit dense here but 🤷‍♂️

I'm looking at BA217 from LHR to IAD at 12:10pm on 19th December 2024. Expertflyer is showing plenty of premium availability (see below)...





...but BA doesn't even seem to be selling the flight at all in premium cabins (also see below). Have set Point of Sale to the UK and EF still reflects good availability with no luck on BA. BA IT gremlin, user interface error or something else?