I booked a one-way ticket (intraEurope) from united.com with united ticket number for travel on SWISS. Only three options - discount, flex, business. Later I realized that what I have is a Light Fare from the SWISS site when I went to do seat assignment.
Hence I went ahead and paid from the SWISS site, 10Euro for a seat assignment (which included the exit row) and 17Euro for one bag.
Why would United book the Light fare from their website?
Also - as *Gold - do I sill have access to the LH Senator's Lounge? Departing TXL.