I've been wondering exactly the same. I tried to view Met trains at Baker Street shortly after SMA2 went live and the app just closes. Been the same every time I've tried since. I now end up checking for trains at Kings Cross or Finchley Road to see what trains might be near Baker Street.
Stations between Hammersmith and Paddington (both) run off the H&C feed only. Circle line feed works in the Eastbound direction only from PAD heading east, Westbound Circle/H&C are merged as they’ve always been.
The one size fits all algorithms that many apps use through the open data platform has obviously caught them out with many apps being unable to differentiate services given that most feeds go for line specific info rather than platform specific which much better suits the Sub-surface lines.
Child of Middlesex, student of the City, resident of the Metropolitan