I am trying to help a friend (a little bit non-railway savvy) buy a single ticket from St Albans City to visit me at Canning Town. The route will be St Albans - Farringdon (Thameslink); Farringdon - Stratford (Elizabeth line); and Stratford - Canning Town (Jubilee). The Thameslink site will recognise a ticket SAC to Zones 1-4 (though not zones 1-2 as it should). But any attempt to buy the ticket produces "no results found". I wondered if anyone knew what I am doing wrong? Or does my friend have to buy one ticket to Farringdon and then use Oyster or contactless to at Farringdon?
Just wondering
Harry
Just wondering

Harry